Oh wow, that is gorgous. I haven't done any quilting yet, but I do plan on starting (maybe this fall - I want to make Christmas stockings for my sibs). I have studied up a bit though. That pattern doesn't look hard, the cats and butterflys are appliques - you've already done two so this one should be ok.
If it seems tricky, you can make it simpler by keeping all the frames the same so that you don't have to worry about getting the dark and light bits perfectly right. (Actually, I'd be tempted to do this anyway for aesthetic reasons, but it would also make it simpler).