I guess you can't put a car in the shot that is not from GT5

(the girls I'm not sure... they look nice though

)
Small images outside of GT5 is allowed. This includes logos, car body parts (e.g. rims, decals), textures (e.g. retro filter grain), small objects (e.g. trees, grass).
Large images are, however, disallowed. This includes background swapping, placing a whole car into the photo, changing the environment entirely and etc.
IMPORTANT: Winners, to allow for a more open competition (not too restrictive), please limit the description of your theme at your own will. (Try to avoid themes like "Mazdas at Nurburgring", or "Only at Trial Mountain")
Please refrain from distancing away from the theme with your edits, saying if there is not really a need for a weather edit, it is recommended that you don't add it in.
Quoting from the OP only big objects aren't allowed, smaller objects even such as trees are fine. A girl is definitely smaller than a tree
