3 Quick concept sketches

well here ya go,i drew these while taking a break from cutting grass, each one took between 5 and 15mins,im thinking about adding a little color to them but i lost all my prusmacolor colored pencils so i might have to you crayola or somthing, tell me what you think

http://i5.tinypic.com/20pdht0.jpg
front
http://i5.tinypic.com/20pejj5.jpg
back
http://i5.tinypic.com/20pengm.jpg

C&C please

The perspective is good in all.
They seem to have a light/relaxed feel to them.
Looks like you had fun making them, not "forcing" the image.

Great work, maybe grab some tracing paper and make a finished version of each.

those are all good but try to keep your lines clean iven if its a Quick

I agree with Si-VTec. Quick concepts are fine, but if the lines aren't clean it looks really junky and unprofessional. Looks good otherwise.

a few things i forgat lol........

i like the first one alot!!! it looks a bit of a mix up with ferrari 430 and a zonda and its kinda buggy stye! good concept!

they are nice sketches.
I have books full of those things that date back a long time.
keep up the good work.

Thanks for your comments everyone.
I was thinking about making some colored versions of them, and i was wondering if anyone had any tips or techniques i could use?

Nice, I love that quick and messy stlye a lot.

nice, i like your style

i couldn't do that in days