Help?

So I have been attempting to draw on the iPad lately, with mixed results. The stuff I posted here was made using the .harmonious app, and I have since tried the one called Paint Gallery. It was okay, but has this little glitch in which it randomly closes everything without saving and pisses me off to no end (twice now when I was almost done - really annoying).

Anyone have any other ideas? I have only used the free apps to date, but would not be adverse to shelling out a couple of bucks if anyone has a particularly glowing review.