What I am trying to do here (or think I am trying to do

) is add engine covers to the PAI C-17 Globemaster??? Their aircraft look good for AI but I think they need a little touching up on the tails and so on... I cant figure out how to exactly cut out an image (.jpg, .bmp, etc) from photo's I have provided for you.... Every time I try to cut out the tail of the C-17 its just jagged and rough

, or wont fit the image and I cant resize without losing all of the quality of the original image??? I know I need to do some experimenting with this for a while but just need some direction with what tools to be experimenting with??? My luck, the last tool I'll try, is the one I need in the beginning!!! Also with the texture file and aircraft already designed by them which I'm not going to mess with, can I add engine covers to the front of the engines when there off, and go away when the lights come on?? That might be a designers forum Q's? huh..... Anyway I would at least like to know how to get the image off of the .jpg and into PSP, where I can layer (still working with that tutorial) on the texture file imported with the DXT converter???
Tail and Fueselage image...
Airliners.net Photos: USA - Air Force Boeing C-17A Globemaster III
Engine cover image....
Airliners.net Photos: USA - Air Force Boeing C-17A Globemaster III