I don’t typically create composites for stock because of the amount of time and effort it takes. It’s something that needs to be weighed with the potential success the image will have. Of course, that’s always the big question that nobody can really answer and a decision you need to make based on your own experience and knowledge of the industry. Here is one I created a couple of weeks ago. I started with two of my own images and the rest was illustrated in Photoshop.
The model is my little girl. She was a great sport and did very well in using her imagination to act out a story. You should have heard the stuff she was coming up with. LOL. She especially enjoyed painting her dress 
Of course, we saved that for last.
Images available with a RF license: Make Your Dreams Come True