I disagree with Bonner. When's the last time we saw a model riding a chopper in Easyrider? If you want to make it look like she's a rider, fine, style it that way. There's no reason she has to look like she's riding or a rider for an image to work of a model with a bike. I'm assuming this is about eye candy.
Now, on toy our eye candy styling. The suit is a little out of place. It's too beachy. You've got this killer iron steed in the middle of all that grass and this beach bikini. Try to get something a little more in keeping with the overall feel. Some cute little Daisy Dukes, or a black bikini would work.
I'm also not a fan of having her arm disappear into the handlebars. Move her hand down the tank. She'll have to lean forward to do it, but that gives a really good opportunity for nice arch in the back.
Be careful not to get in the chrome. I'm having a hard time making out what's in the reflection in the air cleaner cover. Maybe it's a bush, or you. Don't let it be you. Use a long lens and get as far away as you can.
Other than that it's a nice shot.
BTW, plenty of girls do ride in heels and bikinis, or less