you want me to tell you the truth..?
well i get my posts deleted for telling that. but fuck it i want to help.

your use of colors are way to over bright, and the neon blue/green isn't working at all.
your covering up most of your renders with a brush. which makes (any)? sense.

your use of imported cars. is well i guess your own taste so i wont comment on that, i think you should lay off the bevel effects, just doesn't look good... on anything.
unless your modeling with a 3d program no reason to make a 2d image look 3d.
keep working on it and I'm sure you will find something.

try to keep your images flat, and nicer colors.

there are no noobs in art only in photoshop... you chose your path.