First post, PS rendering critique please

So here is about 5 minutes of sketching with ballpoint pen, scanned, and about 30 minutes of screwing around with photoshop. I’ve done plenty of handheld products, but never anything as formally complex as a car in PS.

Please critique my rendering!



before PS, solve proportions and improve your sketching skills…the highlights&shadows would be more easily to apply…and Ps is just a tool (a pretty one of course)