Okay, so how do I add pics of something I painted? (In case I wanted to, though my skills are that of a newcomer really.)

Put them online in an image-sharing website such as Photobucket. Then while posting click the little picture of the mountains on the top right and paste the URL of your photo in the URL field. If your picture is wider than 640 pixels, make sure to write 640 in the width field, or it will appear cropped.