Not a bad first attempt. What camera settings did you use?
I think you've got a few things that you might like to look at. It's a bit hard to tell exactly, but some of the stars seem to have dark rings - if you used deconvolution, you might need to tune that a bit.
In the bottom right of the image, there's some horizontal banding there quite visible. Not sure what is causing that.
Just recently I did a M42 and used the HDR processing in Pixinsight. Maybe that's something you could use to add to this to bring out more in the core? Take some 10 sec (maybe even 5 sec) shots to add to it.