New Square Kat painting: April Fool

I've been working on a new painting (as the title implies), and it's of a Square Kat (also, as in above). He started out as a page in my Sketchbook Project Special Edition, but I'm thinking a lot of those little guys deserve better. So this one's getting himself a portrait done.

First off, here's the original sketch:

And here he is on his Sketchbook Project page:

These last three photos are in-progress shots. I think the background is pretty much finished, but everything else (his fur and clothes and stick boy) is just blocked in.