M101 (reprocessed)

After watching several hours of PS tutorials, I decided to have another attempt at processing my recent image of M101. In this version I've changed several aspects: the blue colour has been reduced, the field of view has increased, I've also corrected some red star halos around blue stars. This last aspect is caused by Chromatic Aberration. To correct this I aggressively shrunk all the stars in the red channel and then applied a black layer mask.  I then painted the layer mask with 15% white on the problem areas and then applied a mild Gaussian blur to the layer mask.