diff --git a/src/GetImgAiClient.php b/src/GetImgAiClient.php
index 505e4ab..13a6093 100644
--- a/src/GetImgAiClient.php
+++ b/src/GetImgAiClient.php
@@ -59,7 +59,7 @@ public function textToImage(TextToImageRequest $request): ImageResponse
 
     public function inpaint(InpaintingRequest $request): ImageResponse
     {
-        $response = $this->request('POST', '/' . $request->getModel() . '/inpaint', $request->toArray());
+        $response = $this->request('POST', '/' . $request->getFamily() . '/inpaint', $request->toArray());
 
         return ImageResponse::fromArray($response);
     }
diff --git a/src/Request/InpaintingRequest.php b/src/Request/InpaintingRequest.php
index aae7822..c63d0ed 100644
--- a/src/Request/InpaintingRequest.php
+++ b/src/Request/InpaintingRequest.php
@@ -11,6 +11,7 @@ class InpaintingRequest
     private string $prompt;
     private string $image;
     private string $maskImage;
+    private string $family;
     private string $model;
     private ?string $negativePrompt;
     private ?string $prompt2;
@@ -28,6 +29,7 @@ public function __construct(
         string $prompt,
         string $image,
         string $maskImage,
+        string $family = 'stable-diffusion-xl',
         string $model = 'stable-diffusion-xl-v1-0',
         ?string $negativePrompt = null,
         ?string $prompt2 = null,
@@ -44,6 +46,7 @@ public function __construct(
         $this->setPrompt($prompt);
         $this->setImage($image);
         $this->setMaskImage($maskImage);
+        $this->setFamily($family);
         $this->setModel($model);
         $this->setNegativePrompt($negativePrompt);
         $this->setPrompt2($prompt2);
@@ -68,7 +71,7 @@ public function setPrompt(string $prompt): void
 
     public function setNegativePrompt(?string $negativePrompt): void
     {
-        if (strlen($negativePrompt) > 2048) {
+        if ($negativePrompt && strlen($negativePrompt) > 2048) {
             throw new InvalidArgumentException('Negative prompt length must be ≤ 2048 characters.');
         }
         $this->negativePrompt = $negativePrompt;
@@ -76,7 +79,7 @@ public function setNegativePrompt(?string $negativePrompt): void
 
     public function setPrompt2(?string $prompt2): void
     {
-        if (strlen($prompt2) > 2048) {
+        if ($prompt2 && strlen($prompt2) > 2048) {
             throw new InvalidArgumentException('Prompt2 length must be ≤ 2048 characters.');
         }
         $this->prompt2 = $prompt2;
@@ -84,7 +87,7 @@ public function setPrompt2(?string $prompt2): void
 
     public function setNegativePrompt2(?string $negativePrompt2): void
     {
-        if (strlen($negativePrompt2) > 2048) {
+        if ($negativePrompt2 && strlen($negativePrompt2) > 2048) {
             throw new InvalidArgumentException('Negative prompt2 length must be ≤ 2048 characters.');
         }
         $this->negativePrompt2 = $negativePrompt2;
@@ -110,6 +113,14 @@ public function setModel(string $model): void
         $this->model = $model;
     }
 
+    public function setFamily(string $family): void
+    {
+        if (!in_array($family, ['stable-diffusion-xl'], true)) {
+            throw new InvalidArgumentException('Unsupported/untested family.');
+        }
+        $this->family = $family;
+    }
+
     public function setStrength(float $strength): void
     {
         if ($strength < 0 || $strength > 1) {
@@ -120,23 +131,23 @@ public function setStrength(float $strength): void
 
     public function setWidth(int $width): void
     {
-        if ($width < 256 || $width > 1280) {
-            throw new InvalidArgumentException('Width must be between 256 and 1280.');
+        if ($width < 256 || $width > 1536) {
+            throw new InvalidArgumentException('Width must be between 256 and 1536.');
         }
         $this->width = $width;
     }
 
     public function setHeight(int $height): void
     {
-        if ($height < 256 || $height > 1280) {
-            throw new InvalidArgumentException('Height must be between 256 and 1280.');
+        if ($height < 256 || $height > 1536) {
+            throw new InvalidArgumentException('Height must be between 256 and 1536.');
         }
         $this->height = $height;
     }
 
     public function setSteps(int $steps): void
     {
-        if ($steps < 1 || $steps > 6) {
+        if ($steps < 1 || $steps > 100) {
             throw new InvalidArgumentException('Steps must be between 1 and 6.');
         }
         $this->steps = $steps;
@@ -177,12 +188,13 @@ public function setResponseFormat(string $responseFormat): void
     public function toArray(): array
     {
         return array_filter([
+            'image' => $this->image,
+            'mask_image' => $this->maskImage,
+            'model' => $this->model,
             'prompt' => $this->prompt,
             'negative_prompt' => $this->negativePrompt,
             'prompt2' => $this->prompt2,
             'negative_prompt2' => $this->negativePrompt2,
-            'image' => $this->image,
-            'mask_image' => $this->maskImage,
             'strength' => $this->strength,
             'width' => $this->width,
             'height' => $this->height,
@@ -191,11 +203,14 @@ public function toArray(): array
             'seed' => $this->seed,
             'output_format' => $this->outputFormat,
             'response_format' => $this->responseFormat,
-        ]);
+        ], function ($value) {
+            // Keep all values except null
+            return $value !== null;
+        });
     }
 
-    public function getModel(): string
+    public function getFamily(): string
     {
-        return $this->model;
+        return $this->family;
     }
 }