WOW those resin ponies are stunning, Aflame!!! ^_^ I hope to try casting a pony, someday soon, but I'm gonna try practicing on a smaller mold first, like a petite!! I've worked a little with 'doming' resin, but I'm sure molding will cause its own set of issues!
I also highly recommend working with resin outside, if you are able - it's powerful stuff, and you can't be too safe with your health!