1:The textures appear to be a flat colour or pattern fill without any shadows or highlights. Try adding a bit of highlighting to areas to areas that would be convex or raised from the surface, and shadows to areas that would be concave or lowered from the surface.

2:The textures appear to be mostly a flat colour or pattern fill, with very little shadows or highlights. Try adding a bit more highlighting to areas to areas that would be convex or raised from the surface, and a bit more shadows to areas that would be concave or lowered from the surface.

3:Your textures have some shadows and highlights, giving contour and dimension. In future it might be worth it to add a bit more shadows and highlights, though.

4:Your textures have some nice shadows and highlights, giving contour and dimension.

5:Your textures have excellent shadows and highlights, giving great contour and dimension. Goed zo!