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Tough one to start as your first galaxy, it's a lot better than my first one.
The galaxy has come up well, you're doing the right thing using lots of exposures.
Some things to generally look for in an image are
Focus across the image (stars are usually the way to tell), both in size, shape and also in the corners of the image.
Color balance, whether the sky is a grey, a little bluish tinge is quite acceptable, plus generally balanced. Saturation can be a personal taste, people do look at star colors, ie yellow and blue, and ifnyou are really fussy the distribution of the color across the star.
Lack of noise, usually in the background, more exposures helps, what's leftover can be selectively filtered or blurred.
Framing, just he balance of interest in an image... Personal taste at times.
Histogram, this will show all kinds of things, but you want to see no loss of data (clipping) and use the data to it's reasonably full extent, jet black skies generally not preferred.
Just a couple of things to check prior to completing an image.
For a first galaxy I it's a beauty, well done.
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