Send them via email as attachments or as a zip file to email@example.com
It is very helpful if you provide information in the meta description field, such as materials used and your interpretation of the art piece. Please focus this information on that particular piece of art. Adding keywords (tags) to the image will also be helpful in getting it found; keep the tags useful such as your name, username, type of art, subject, etc. Each photo of an art piece should have your name and your Art Storm username in the tags!
Most galleries, including ours, pull the TITLE, DESCRIPTION and KEYWORDS from Photoshop. If you add this information before you distribute your image to various websites you will only have to do the work once.