The abs and lumbar are hardly visible, great job and in my opinion not all art needs to be detailed to be good but you could darken or lighten the faint lines on the front of the chest to make them stand out more.
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Um... Yeah you could just explain it.
Mud box is a 3d art program that lets you do mapping and design twice as easy. You can draw on 3d surfaces instead of doing it on a flat. uFantoms set was made doing this.


