Please tell me my problem areas thanx
http://africanbenz.deviantart.com/art/Mazdaz-kazamai-concept-97065466

It looks like your front wheel has perspective issues. Draw an imaginary line through the front axle and make sure that's in line with the rest of the perspective lines. Otherwise, it looks good to me.

thanx sven c i'll give it try and see wat u think.am having problems rendering it wat do u suggest?

Look for some tutorials and look at the work in the portfolios.
what do you use for your renders? i see your folio and i cant tell.

These sketches do look good, just proportions need to be fixed, and use with care.

thanx v&g i use soft pastel but not of the best quality they are hard to find here in Africa.How would u suggest i get my work in propotion?

Here is the reworked kazamai i said i would do i think it looks a bit compact.
http://africanbenz.deviantart.com/art/Mazda-97446765