Hello, and welcome to my shop!
Since I don't really contribute much here with forum posts, I'll try my hand helping develop skins for those who ask.
A few ceveats, though:
1: This is pony-model only. No human skins here.
1 a: I have no experience with griffons/changlings, so if you ask for one, don't be surprised if the skin is sub-standard.
1b: I cannot/will not do dragons. I can't even imagine a way create an acceptable looking one with what I know.
2: I will do SD, and attempt HQ skins (up to 512x256). No HD (1028x512), sorry. (This is a lie. If you just have to have an HD skin, I will attempt it. I have some more practice with paths and such nonsense in GIMP now.)
3: Pictures are helpful, but not required. But if you don't, give me ALL the information you can, because if you just give me "pegasus, light brown coat, dark brown mane", that's all you will get. (Defaults are full length tail/mane, fully open eyes, small closed smile, no distinct hooves)
3a: If you have a SD skin of your own to use as a start, even better!
4: Yes, I'll do clothing/accessories!
5: If you tell/show me a short/thin mane, I'll try for it, but if it looks odd to you, I'll change it to a "standard" mane. (Like I said, more experience now.)
6: Don't expect instant gratification. Requests could be completed within an hour to a week, depending on complexity and scheduling. Be understanding.
Okay, maybe not "a few", but this is important to know! So if you decide to place a request, put "For the Grand Pegasus Enclave!" in your post. Or "Stop the...", or "I'm against the...", however you feel about them. (This I could care less about now. I'll know if you read the rules or not...)