I am looking for a better paint prog then the default that comes Win

I am working on a project that the default Windows 7 paint can't handle. Please look at the following attached picture. See the left side nacelle? I want to copy the nacelle then past the nacelle in as a 3rd nacelle mounted between the 1st two nacelles. (see the red line in the picture? that's were the 3rd nacelle sits) Because the nacelle in the original picture is at an odd angle the square box outline in the default Windows paint won't work. I need a cut and past outline that can do more then just square box's. Anyone have some ideas?


Steve