Nicolae,
Firstly could I comment on how stunning all of your images are. Your work is very outstanding.
Now the questions? Let's go one at a time.
From what you've posted so far I gather that your images are a mix of vector and bitmap (photograph) images. If this is correct, how do you get a photographic image of a vehicle or person to blend so accurately with your vector drawings?
I've got a lot more questions but if you could answer this one first I'd be more than happy.
Regards