Yes you may colour these lines if you wish, you don't need to ask. Just go for it. HOWEVER you MUST credit my lines in your artist comments and show me when it is done. You also can NOT remove my artist signature but you may add your own. Have fun.
The sketch version can be found here ->
I also plan to colour this in soon.
I totally i needed to draw something that wasn't an elf. I wanted to do something where i could just let go and just go with it without an real planning. This is what i ended up with. Hope you like it.