The camera I use is a Canon Ixus 500, so thats not very fancy or very good.
Just beware of having enough light for the shots
To make a model not look like card.....I don't know. I'm not doing anything special to my models.The only thing I do is coloring the white edges where I make the cut.I don't use sprays or anything else.
I know there are some that uses some varnish spray. But thats only for kits printed at home to prevent the ink to smear. I only build kits that is preprinted from the publisher, so smearing ink is no issue.