after going through all the pages i gotta say, you really have some talent there.
I remember when i first started, it took me two months to learn how to make an editable poly in 3ds max.
If your looking for a little advice on how to make your renders more realistic, try (if you can) to use global illumination, id recommend the mental ray renderer for beginners since it pretty much comes with most 3d packages now. or if you can get your hands on V-Ray or Final render, even better
also since your just starting out, i highly advise you to start learning UV mapping as soon as possible
because the key to a kick ass scene is perfect lighting, models and texturing.
keep up the good work mate!