You're not allowed to add your avatar because previously there're hacks to the forum, and admins thought that avatar was the source for them injecting malicious code to the forum...
Also newbies can't post images here due to security problems (or maybe anti-spam). You may need to link a external website with examples of your designs.
Learn more about bitcoin by discussing here in the mean time for you to upgrade to Full Member
You'll be surprised how big the community is