You mean like art pieces?
It's possible if you save the art piece to your computer first - then use TinyPic (http://wwwBannedImageSite) to uppload the picture (there is a box named "Resize", I recommend you use the "Message Board 640x480").
After you've clicked the "Upload" button you'll get a few different links to choose from - copy the link url that says "IMG Code for Forums & Message Boards" and paste it here on the forum in your reply box and the picture will show ;3
Click preview before you post so you see that it worked out as it should.
Also make sure you have the artist approvement to post their art if the art isn't your own!
Hope that helps.
Cheers~ // Shallow