It’s fun to see what kind of concept art players have come up with however. If you’re looking for player made concept arts, then you’ll have to look elsewhere. [Guild Wars 2 main page]
If the official concept art doesn’t suite your particular style, there are plenty of other options out there. That’s what this page is for; here is a list of other websites that have Guild Wars 2 concept art:
There’s not really much user generated content on concept art. The game hasn’t been out long enough for users to make much of anything. In the following years there should be much more concept art for players to play around with. Until then we’ll all just have to wait.
And check out the "suggested by the author" links below for more!