I love all three of your renders. If these are your first images submitted then I truly can't wait to see your work as you progress in experience. You seem to have a real skill for ancient ruins/architecture and your modelling skills are superb. The only critique I have is in agreement with Vasquez, play a little with the contrast. Do you have Gamma Correction on or off? Your scenes would benefit greatly with a lot more depth of shadow (but they are absolutely brilliant as they are so take this as only a small critique). I really look forward to seeing more of your work. I love ancient architecture myself so have been very impressed by your efforts. Keep up the good work!