It's the art: gloomy Marco

Probably it is the long time I need to obtain a decent resemblance, but when I am drawing a portrait from a real life model instead of starting from a photo, I always obtain a sad and gloomy look, completely unlikely the mood of the subject.
Fortunately the only model I can keep still in the same position for a couple of hours is myself, although the result is an odd face like this where I look as if my cat just decided to leave this valley of sorrow.
So instead of taking it as a basis for a brilliant self-portrait like the ones of Albrecht Durer, I used this drawing to play around a bit with Photoshop and see if I could learn something about layers and colouring.
I think that Photoshop and the like will represent for the visual art of the 21th century a dramatic change in medium as oil painting was during the Renaissance, we just need another van Eyck to show us how to.
Pencil on paper and Adobe Photoshop layers, 24x33 cm
(Click on image to enlarge)