Hey my friend I would be happy to try and help you out. I need some more things to draw with my new found love of sketchbook pro. The coloration will be like the last picture ("she turned into a tree Dashie).. You can check out some of my stuff on this thread.
http://mlpforums.com/topic/77491-robin-hoof-draws-some-ponies/page-2#entry2019104
No exchange needed either, especially if you end up using them in a video. Just credit where credit is due. Definitely got some new I learned about and am excited to try. I also assume you just want pony and no background. Pm me with interest and links to your OC. No violence gore or "sexy" ponies though.