You are only allowed so much space on the server as a non subscribing member...subscribing members, who help pay for server space get more...it breaks down like this:

Regular users:

max pic size: 1024 x 768
Max single pic size: 500,000 bytes (near half MB)
Max total of all pics size: 10,000,000 bytes (near 10 MB)

Subscribing users:

max pic size: 1024 x 768 (same as above)
Max single pic size: 500,000 bytes (near half MB) (same as above)
Max total of all pics size: 100,000,000 bytes (near 100 MB) (10x above)


More info here on subscribing:
http://www.m715zone.com/vb/showthread.php?t=12813

Note: In that link, the first post has size and quantity limits that are outdated now...need to edit that I see..