Nice drawings arun.yothin! I think the first one is the best, but if you want to have a more cartoon look you should draw her much taller! It looks almost as if she's a 16 years old! Look at Jessica rabbit for instance (see attached picture, it's not mine) This is an old cartoon character but really a good example for a sexy cartoon girl. By the way, she's the sexiest cartoon girl I've ever seen... Her legs are long, her hips are large, her waist is slender and her boobs are huge! Furthermore her hands and her feet really small.
As my teacher says, in cartoon characters the most important are the
porportions. Your drawing is something between realistic and cartoon, at least that's my opinion...
For the second one, I'm eager to see that black and yellow latex when it's finished. It makes me think of a Uma Thurman in Kill Bill and of Ayumi Hamasaki's Startin' PV. There are a few scenes in Ayu's PV where she wears black and yellow latex and rides a motorbike aswell. Man, that's so
hot it litteraly leaves me mouth watering! Here's the video, maybe it will inspire you, the quality isn't very good though and skip the intro, it's bullshit! (by the way the girl in the jeep is hot as hell, I wonder who she is...)
The third one is alright.
For the last one, it would be much sexier if the top girl would look at us. For the bottom girl I think the pose is not that bad except for the neck, it doesn't look quite right. I think it deserves a big close-up aswell, I mean her face should be very big and the rest of her body in a more "pronounced" perspective... I'll show you what I mean with Mikie Hara:
The second picture is an especially good example.
Wow, that's a long post! Well, keep up the good work!