getting better at photoshop

hi all i have been useing photoshop for abit now and just geting the hang of it so thought i would put it up its not the best but its ok wheels are shit and lil bit im still getting the hang of so let me no what yous think tips n hints will be good im useing cs4
and i cant paint silver or white cars thay have to blue black red yellow base

and i cant paint silver or white cars thay have to blue black red yellow base
