if you go to the buy/sell/trade forum you can make a thread in which you offer to sell your skies. photos will help. if it is a good offer people will make offers and you can either conduct business in the thread or pm the person that is interested.
sell in media and arts, the b/s/t forum is a trick, it's only for scammers
don't post a detailed descriptions, pics are scorned upon, ask a very high price, it will sell, people generally pay a lot of things on here, make a lot of typos in the thread just to enhance legit-ness, all the scammers tend to use proper grammar, and only accept payment via cash in an envelope
I'm only making this worse but, I heard sending your cash to Nigeria is the best way to do business. If the person says they will first need to deposit a large sum of money in your account, provide them with your account number. The pms or emails will usually have bad grammar and odd spellings, but ignore this since teh gr4Amm3r iz 4 teh no0bs!!!!1!111!!!1one!!!eleven!!!.