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. See: Tutorials: How to add shadows and highlights. Even skin-tight items should have some shadows and highlights. This is a TS2 tutorial, but the principles are the same in TS4.

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. See: Tutorials: How to add shadows and highlights. Even skin-tight items should have some shadows and highlights. This is a TS2 tutorial, but the principles are the same in TS4.

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. See: Tutorials: How to add shadows and highlights This is a TS2 tutorial, but the principles are the same in TS4.

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!