The sketch is the composition
Layout, proportion and pose come from your drawing. The model supplies material, light and finish, which is the part that takes hours by hand.
Say what it is made of
A mug sketch can render as ceramic, steel or glass. Name the material and the lighting, and the render stops guessing.
Rough is fine
Clean line work renders most predictably, but a rough thumbnail works too. What matters is that the shapes are readable.
FAQ
Will it keep my proportions?
Mostly. Heavy stylistic instructions pull it further from the sketch, so change one thing at a time.
Can I use a photo of paper?
Yes. Shoot it flat with even light and crop to the drawing.
How is this different from image to image?
Same family, narrower intent. This page assumes your input is a drawing and the output should be finished.