After watching Kent's amazing sculpting tutorial I finally learned a little bit of it. First I did the fabric exercise and then this sculpt.
I saw this amazing drawing by Dan Mora, where he took a more traditional ninja approach on Mikey:
https://www.behance.net/gallery/10322389/TMNT . I totally loved it and decided to give it a go in 3D.
Sculpted in Blender rendered in cycles. Hope you like it.