Preferably, upload it not as a .tga, as this is not picked up by vBulletins thumb-nailing, and also is very large (4.5MB). I'd reccomend .JPG, .PNG, depending whether or not it contains alpha.
The image itself is actually quite nice. From your presentation, I was expecting something far worse, and was pleasantly surprised. Things to work on would be: Lining up the seams on the stairs, the fact that the chest looks out of place, the stretched texture on the up-close walls, and the use of fog.
Fog-wise, I'd personally brighten it up, and probably put the start point somewhat closer to the camera. But still, I like what you have here. | 
