I am using this tutorial for my Friday assingment..
Note: This tutorial might not be very useful unless you use the technique for things such as advertising and such. But it teaches you a lot of ways to blend two objects together.
When they ask you to use the burn tool, i suggest you use smaller pixels for more freedom as to which part you would burn.
Use the actual pear photo because the effects such as the Levels are for a green background. The picture of the face is up to you
Level Between 1 and 2 (my thought)
This is where I went to learn Photoshop stuffs during the summer and break. Many helpful things here. Tutorials are at the "Tutorials" section of course