Putting your models under the best light in order to show them off online (or elsewhere) is important in order to do justice to your work. Here's a short tutorial to show you how to contour your model pictures in order to integrate them on another background which would show them off better.
This tutorial was made using Photoshop, but can be applied to other software such as Gimp (which is a free equivalent to Photoshop).
One important thing – use a high resolution file for this kind of work in order to get an optimal result.
Good viewing...