Peugeot 206

[razor designs]

Hey all, I need some assistance, I'm trying to design and brush a kit on a Peugeot 206, but, I'm having trouble trying to figure out where the shadows and highlights should be for the vent on the side skirt and the small one on the front bumper

Here's the pics

Original:



Brushed with stroke path's:



Bit messy I know, but no one's gonna see that when finished

Brushed:


I know, front bumper need's fixing and side skirts need tiding up

The vents will be a bit different than in the pic when finished, just need a little help with the shadows and highlights for the two vents

I know its not very creative, but it's my first time brushing a kit so want to start off with simple stuff and also my first time using the pen tool

Thanks in advance