This is just a sketch, finished work will look much better. How much depends on the tier achieved but even simple lineart will be refined.

Rules:
-female only
-any pony race+changellings
-paypal only
-payment within 48 hours after auction end

Tiers:
up to $20 - finished digital lineart
up to $30 - flat colour
up to $45 - fully shaded
above $45 - nsfw version
AutoBuy - two additional outfits, details to be discussed

Good luck and have fun!