i too think that Massimo's constructive criticism is spot on...
this is a great community where people help each other, always in a positive way... but for that to happen, we gotta have an open mind and accept other peoples opinions
if you think that your work is perfect and can not be criticized, then why post it here?
i guess, when we think so highly of ourselves, the problem is always on others, right? 
hi, im not very good at rendering, mainly because its not my primary focus, but i had to do this one
VRay 2.0, rendered at 1600x1200, high exterior preset with ambient occlusion
Dragon material is a glass bottle vismat, changed the RGB to 33,160,8
Dragon Balls downloaded from wharehouse and just added reflection
i think the door should open the other way...
imagine yourself entering and than having to squeeze yourself against the wall to be able to close the door...
sorry for the observation, but as an architect i cant help myself to notice these detais...
overall, nice work 