All together now... I redrew the zoo background this morning, using an older file I had drawn about 7 years ago.
I think my favorite discovery with this piece was adding the sky and clouds. I used an older clouds file from another painting. That's one reason I love photoshop so much... you don't have to reinvent the wheel every day.
No doubt I'll continue to change the colors saturation levels and other details. But it's just about finished now...