First of all, awesome colorization.

As you ask, I will give you some feedback.

The yellow (gold?) is in a slightly different tone than the rest of the colors, to the point of bringing to much attention. It seems to be gold, or at least trying to make it look like so, so of course it would pop out a bit, but the way you colorized it makes it pop out too much, whenever I see the image 90% of my attention goes to his shoulders and buttons. Maybe tone it down a bit or apply different shades of yellow depending on where you are colorizing.

Same goes for the blue tones, they look washed out and too homogeneous, with no visible (or only a few) tone differences.

Blacks and shadows need more depth, specially in the cap and its fur(?).

You absolutely nailed his face, it's really well done. I would add a little more vibrance/saturation to the whole face, but that is a matter of taste and a signature of each artist. Some areas of his face look a bit strange, like his right cheek, though. Maybe add some reddish tones to give it a more vivid look? Same goes for the eyes, maybe adding a bit more color/saturation (bit just a tiny bit) would make it look less glassy and more "real".

His neck needs more colors.

The badges are spot on.

The background looks a bit strange, but I guess it was already like that. I've colorized old photos and sometimes the background is terrible, first due to the lack of creativity of the photographer and second because of scanning quality (which sometimes messes up the background). If this is a personal work with no intention to be put in a museum etc, maybe add a soft, blurred background. A gradient on top of it could also make things look more natural.

All in all, awesome work. Congratulations!