I picked up a copy of Codijy Colorizer Pro during their Black Friday sale. I just noticed it's back on sale for the holidays. If you are a colorizer, it might be a good addition to your tool box. If you're used to doing things with layers and masks as in Photoshop, this program takes a different approach. Rather than masking an entire area, you just apply color brushstrokes to roughly surround the area you want colored. The program detects the boundaries and fills in the colors.
The photo on the left below shows the brush strokes. The yellow-green patterned strokes are the ones that define "protected" areas that should not change from the original. The photo on the right is what was produced after the strokes were processed. I think that's a pretty nice result.
Anyway, if this interests you, you can find the program at
https://www.codijy.com/store/.