I'm just a total beginner, that tried colorizing one of my favorite doujins.

nice thanks for the work. classic doujin

Base +11, tedderböse +6, nodire +6, Qurtie +6, Castrated Caligula +6

yet another colorization that looks like absolute garbage, well done

Base +6, tedderböse -6, blulaz -7, mickeysofine -6, 321aussy -8, ohgodwhai +6, kishin -6, sandsz -6, proet -6, Rabbitman91 +10, nodire -6, CynicalHamster -6, Seveutiel -7, and 8 more...

@akx69 as I wrote I'm a total newbie at this. What are some good colorizations in your opinion? I'd like to get better at it!

Base +7, tedderböse +6, proet +6, nodire +6, matias067 +6, Castrated Caligula +6

nice job! You could try searching on youtube "how to color manga panels" for tips.

Can you try coloring the English version of "[Abradeli Kami (Bobobo)] Chotto Matte to Iwaretatte"? Thanks.

Base +15, nodire +6, tedderböse -6

It's a good start but it currently only has flat colors in. You need to add the highlights and shadows in, check the cover page on how bobobo has done this so that it's consistent with his style.
Pg 18 looks odd where you can see her nipple through his head. It should read more like x-ray or something but you've painted it like the nipple is part of his throat. Look at more references if you want to learn more. You're doing good, just need to add the extra touches.

Base +6, matias067 +6, JJPG +7, Castrated Caligula +6, Hooterjerker +2, GravityQueen +6

Thanks for putting in the effort. You're off to a good start!

Base +6, Castrated Caligula +6