Once again colour changes look good,
But as I mentioned on your polo, don't bother with the smoke, photoshop's ability to render 'clouds' doesn't produce the most realistic smoke

You should also avoid using lens flare at all, it always spoils a chop.
Another tip would be to use base pictures that aren't studio pictures - it makes it a lot easier to produce realistic looking work
But you're new - you will learn lots! Just keep going that's all
