I've heard artists say that color can't improve a drawing, but it can surely ruin it. I would certainly agree with the latter. This is a page I scanned out of a coloring book that my wife had, the art is in a word: awful. All the line weights are the same, it is very flat, and some the lines don't make any sense.
I wanted to see if I could take really bad, flat line art and give it life -- I spent about an hour and a half on this (after flatting) and I could go another 10 before I had something I was really happy with. The lines aren't colored in very many spots but I did cheat a bit by redrawing Drogon's eye and adding line weight a few places. I didn't touch dany though she is probably the most offensively drawn part, I just pretended she wasn't there.
The drawing wasn't as successful as I hoped but it was fun to color something from the got world for the first time.
Will upload a speed color of this here in the next day or so here: www.youtube.com/channel/UCIs2o…