Ok well you go to the corresponding art forum, then when you get onto a new topic. Click the button at the top that looks like a photograph with a floppy disk next to it. Then click 'browse' to find your picture, and if you don't want it resized, press the arrow and select 'No'. Generally if you scan in something pretty big, a good size for it to be is the one labeled '800 px width (for forums)' Then wait a bit and then some codes with pop up. Click on the bottom one and right click and select 'copy'. Then click the picture at the top that just looks like a photograph, paste the code into there and press ok. Then you will have your picture in [img] tags ready for us to see!
If you need pictures just ask <3