What exactly are you posting? If you're posting in art threads only to arbitrarily bump them without any meaningful content, that's obviously discouraged. There's nothing that says you can't bump your own art thread when posting updates and what not, just don't be too excessive about it and you should be fine.
[quote author=Rule 7]
No double posting within 3 days. If somebody hasn't posted after your post and you need to add something, simply edit your existing post. This only applies if it wasn't because of lag. Double-posting is, however, allowed when adding to project or news threads (but try to edit instead if possible).
For future reference.