Update README.md

README.md

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 title: Sketch To Photo AI
 emoji: 📊
-colorFrom: pink
+colorFrom: green
 colorTo: green
 sdk: gradio
 sdk_version: 6.10.0
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 license: mit
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+# Sketch-to-Photo AI
+This project uses **ControlNet (Scribble)** and Stable Diffusion to transform hand-drawn sketches into realistic photographic images.
+
+### Tech Used
+- **Model:** `sd-controlnet-scribble`
+- **API:** Hugging Face Inference API (Serverless)
+- **UI:** Gradio Blocks
+
+### How it works
+ControlNet adds a "spatial map" to the diffusion process. Instead of the AI guessing where objects should go based only on text, it uses the lines of your sketch as a structural guide, ensuring the output matches your original drawing perfectly.
+
 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference