Thanks for the comments guys, glad it's going down reasonably well
Have removed the extra circles that were on the wings/bonnet, looked better for a start *lol*. Now replaced with a scaled down version of what I'd originally considered, including another couple of naked ladies! Done it in an inverted triangular shape pointing to the S on the bonnet, and by leaving the sides of the bonnet free it more clearly defines the difference between the side and the bonnet. Also added a couple of even smaller circles lower down on the bumper to bring the sides round.
Didn't think it would make this much difference, but I'm much happier with it now, the overall visual balance and weighting of the design falls into place nicely
Too dark to get any decent arty pics so just a couple from on the drive