retouch vs color in

retouch and color in both are verbs.

Word	Noun	Adjective	Verb	Adverb
retouch	No	No	Yes	No
color in	No	No	Yes	No

As verbs, color in is a hypernym of retouch; that is, color in is a word with a broader meaning than retouch:

Other hypernyms of retouch include color, colorise, colorize, colour, colour in, colourise, colourize.

retouch (verb)	color in (verb)
alter so as to produce a more desirable appearance	add color to
give retouches to (hair)