Change just one part

Paint over an area and say what it becomes — the rest stays exactly as it is. 10 credits.

Fix one part without touching the rest: brush over it, say what it should become, and Hewly repaints just that area as a new version.

Step by step

Open the model. In the panel on the right, find Repaint an area and tap Start painting.
Choose a brush: Small, Medium or Large.
Drag on the model over the part you want to change — pink marks show where you painted. Drag beside the model to turn it. Undo stroke and Clear take marks back.
Type what it should become, for example red leather boots.
Tap Repaint this area — 10 credits. A new version opens; your original stays as it was.

How it works: the whole model is painted with your words, then the new paint is kept only where you brushed. The edge is blended, so colours can shift a little right at the border.
It works on a model that already has paint and is one piece. A grey shape preview needs Texture this model → first.
If it fails, your credits come back.

Give the whole model a new look — Same shape, new paint, from a description. 10 credits.
Resize, simplify and more — Real-world size, fewer triangles, fresh UVs — under Do more with this model.
Make your first 3D model — Type an idea, get a textured 3D model. 30 credits — you start with 100.
Pick from 4 pictures first — See 4 drawings of your idea for 8 credits, then build only the one you like.