Hello dear Nipuni! First of all, Happy New Year! (both 2017 and also the upcoming Chinese one in a few days xD). I was wondering if... you could tell me who you color the lineart, I mean, how you do color the line >///< Call me silly, I've tried a lot of things and when I paint, it always ends up changing the line color :S I've even watched Matt Rhodes painting and couldn't figure out how he did it. Could you please help me? Sorry if I disturb you! U_U" I really love how color clean your art is!
Hello! Happy new year to you too!! It depends on the software you are using, make sure your lines are in a separate layer, then lock the transparency of said layer and paint over them, the color should only affect the lines this way (or whatever you have in that layer). In photoshop it is this button
and in SAI it is here
It will allow you to do this
I would show you more programs but I only have these two, I hope it helps!



















