Did you retouch/colorize this by hand or with a computer? True photographic restoration artists are extremely rare in this day and age. My father finally quit his business of hand retouching and colorizing due to the digital age. But I know there are still truly gifted artists out there.
In subreddit r/CombatFootage
In a post titled:
Two danish soldiers waiting for the germans on the 9th of april 1940 colorized by myself