I never did get around to completing the entire set of 9 TMNT artcards...but here's what I have so far.

Again, these are based off of Mirage Studios' style - the way they used to look like when they first appeared in comics in the mid-1980's, so they all wore red ;) Splinter is how he appears in the first comic.

2.5 x 3.5" Bristol board, inks, Prismacolour markers