Just to prove I'm working on it

Just to prove to everyone that I'm actually doing shit, here is what I've got so far on Bubbles part 5. I'm sketching out a background for the whole thing right now.

If you're willing to give feedback on the ponies, please do! Nothing is set in stone, and I can change anything that needs to be changed because I'm still working on it. Also, is that derpy's dad I see? He's being introduced for the first time! What do you think of his design? I need to give him a cute mark!

What should his cutie mark be?

EDIT: Holy shit this thing is huge. I'm gonna have to shrink it down a bit before I upload the finished version.