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A great first effort.
Regarding the core, M42's core is exceedingly bright and HDR techniques are virtually mandatory for retaining the core detail without compromising on the surrounding nebulosity. It is possible (depending on your camera, settings and telescope) that 120s and 180s lights are going to have clipped the data in the brightest part of the core. The solution to this is to shoot shorter light frames to retain the core as well, and then blend later.
You should find that lights between 15 and 30s will retain the core details although in APP you will need to back the stretch off significantly to actually see them. Then in Photoshop just blend the core in with an image stretched for the surrounding nebulosity, and done.
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