so here is my first attempt. i had issues with clouds moving in and out f the sun during the shots and later when combining the images in PS my sons face was slightly distorted. its tougher than i thought but i will keep trying to improve. do i atleast have the idea? this image was made with 6 images from my 70-200 f4 @ around 200mm
Looks like you're off to a great start man. One suggestion would be to have more background/foreground included which helps emphasize the seperation. If the shot's too tight you lose that focal distortion that helps make the subject "pop".
ETA: Although, given the fact I initially thought the white bits bottom middle of the stump was a stuffed dog you could say I have no idea what I'm talking about....