My first thought on this shot is that it's WAY to busy. You have MANY MANY unnecesary elements. If you could drop a cloth or something behind the girls and bike, you would improve this shot by leaps and bounds. The lighting on the girls is a little harsh and uneven. The front girl is overexposed in hand and face back girl looks good!
TC
I would have included the whole vehicle on the photo, it's so beauutiful, why not show us the whole? I am not interested in the girls, this is a vehicle challenge, and they can add a nice element to the vehicle, IF the vehicle is your main subject. Now I feel you photographed the girls with the vehicle and not the vehicle with the girls - if you know what I mean.