You could create an object and use a Shrinkwrap modifier to make it stick to the surface, or, in the Shader Editor, use an Image Texture that you’ll make move with an empty?
If you want to be exactly as in your picture maybe you should do it in Sculpt mode or pulling vertices in Edit mode? Do you really need it to be exactly the same?
yes but I guess it means that you need to recreate a shape that mimics the sheet shape? I must not be easy but maybe Sculpt is the easiest way to do it?
yes you are right i need to recreate the sheet. do you think sculpt is the best way? could you give more advice on this. working on meshes in edit mode will be too complex i guess.
this is camera mapping, I don’t know a lot about it actually, you need to put your photo as background, create a plane with a perspective close to the photo’s, then sculpt, I hope someone will give good advices