Another Paint / Anim program you can use is Cloanto's Personal Paint v7.
It supports custom screens, AGA, and multiple file formats, like JPEG, BMP etc.
I use it more then Dpaint.
Another anim program you can try is Disney's Animation Studio.
http://www.youtube.com/watch?v=qSeYivHZpB8And another item, if you are more serious about your animations, you probably need a graphic tablet. Old WACOM serial work good with accelerated Amiga. When you are interested, I can dig one out and tell you the model number.