Lineart on paper, coloring on SAI, effects on Photoshop
Giving you a better look at Glino's design.
This picture turned out to be a LOT darker than it was supposed to. And trust me, Glino isn't any "creepy creature hiding in the shadows", no, he's more like an alienated being that can go to extremes in order to avoid contact with other living things.
You could say the metaphor of his hairless underside and eyes under his wings is something among the lines of: "To see well enough you need to show your weak side."