However you think you cannot create, just go and do it! Your mind is used to see, imagine, and render the final product with what you have around you. It's meant to adapt to many circumstances even if at first it could seem like nothing. Trust yourself and act.
It does help to have a great and beautiful model and to have a good camera set up, but sometimes you can be in difficult situations. It was 3pm on a sunny summer day with wind and very few clouds. Most wouldn't have taken any shot, though, that's the only time we had. See not what is in front of you, but what you can do with what is there. Photography has always been more than taking pictures. It's about realizing an image with the camera, light, and editing the pictures to render what you had in mind. Yes, even in the film days, very talented editing was involved creating those memorable images we have all learn to love.
That day I saw the green, the warm sun, the red of her lips, and the blue of her jeans, and the sky. To contrast it all, I used her dark long hair.