How do i do shading in my drawings?
This may not help you(hope it does), i usually plan on the picture where the light is coming from (indicate by drawing a lil sun ie light source) Then if you have a camera, take a pic of yourself(or get someone to) and use that as a reference to shading as for creases just think on the direction the clothes are tugging and put the creases to show it has movement i guess,then shade behind the crease on the other side of it(from the light)