I love the look of the legs, that's a really interesting way to do a digitigrade design!
The Inika mask looks fine, but I can't help but feel like a more gladiator-like mask might help the theming better.
The green crotch piece is a little out of place, but it looks better with a green mask. The Ben 10 logo also does too, but little can be done about that, so it's fine.
Really awesome! Nice work!