Carousel:
Comes with the green winged petite with curly tail (I see you have two. I'd put the nicer one with the set) and the rearing pink petite with blue tail.
I got mine for $12 with the box:
img.photobucket.com/al...rousel.jpg I think I got an amazing deal on mine. With the box, and proper ponies I'd say try and get at least $25-$40 plus for your set. I usually see them more discoloured, or with damaged stickers. (Yours seems to be missing only the ticket booth. not exactly a big deal.

)
and here's a recent ebay listing for another that sold.
www.ebay.com/itm/My-Li...1c1f88d7c9
The white petite with purple crown and yellow tail & orange petite, curly purple tail belong to the castle. Sold together I'd ask for somewhat of a premium, since it would save someone buying an entirely new playset if they were missing those two.
The blue pony with red hair is the "rare" one of the lot. I notice the underside is marked up, if it can be removed, I'd try and get at least $7+ for her alone. (if she cleans up really well- maybe more)
Yellow with pink hair- beauty shop. Pink with curly purple hair - market.
The rest are the very common tails ponies. I haven't paid much for mine per piece. (.50 cents- $2.00 on ebay, or per peice from lots on forums). You have a few I am missing. If you do sell, please let me know.
***edit to add, pink with aqua hair and mittens belongs to the pony prints cabin.