Hmm, guess so. I hadn't seen the newer designs.

 That's how yoshi's back is.

 Don't  know why, I just Looooooove that one :o

The line is getting darker where it could be lighter and vice versa, for instance on the nose it's getting dark whereas on the tail it's rather light. 

Cool art anyway!

looks like a koopa shell on his back, since it's convex and not concave.

Ow! This is nice! Like it.

 oh yeah, thanks for the warning  

 Just so you know: it's spelled "Yoshi".

Very cool, though. So smooth...