I would say the lineart is lovely and powerful, but the colored version lacks visual impact and power.
color/light - everything is pretty gray, you don't have many details of interest to look at, so compensate this with strong colors for a quick and effective impact.
Also considering the quality of the sunlight you can seperate light and shadow planes with light and shadow hues to even strengthen the impact.
eyes: second spot of interest are the eyes, in yours they look dead, which is pretty bad for the character. Even if it's an undead, a vampire or whatever you should add the pupils and rather go for a more fancy form.
cast shadows - at some spots you could add pretty simple cast shadows to make things pop and give the things more form, you have them in a few spots (like beneath the hat) but you can add them at a lot of other spots and much more powerful.
framing elements: the framing elements of the leavas add a pattern where you don' twant to have the viewers eye, simplify them in a big single cluster there.
composition lines: you can use open space like the sky to add a few powerful composition lines to emphasize depth and guide the viewer to the points of interest.