There is a lot to say about the technique and about light and shadow, these portraits are good but they lack a bit structure. Especially the main heroes features seem to float a bit in his face.
Alright, but I just wanted to mention the likeness and how you present the characters:
The blonde haired guy, in the game screenshot looks determined, strict and rebellious.
He hasn't got a big forehead, his mouth is small and the lips seem to be pressed together. His eyebrows are strikingly long, like he has some elf-genes in there and additionally they are blonde which gives him an exotic, foreign feeling. Combine that with a very thin nose. (The game is most likley produced for a japanese market, characters with bright red or blonde hair and bright eye-colors are usually "the American" or "the European". Often their features and foreigness is exaggerated.)
The eyebrows sit surprisingly low over the eye, almost like he has that angry rebell stare where the head is tilted and the eyebrows go over the upper eyelids:
http://static.tumblr.com/z9cnfuk/foz..._photos_05.jpg
(only his face isn't tilted down, compare the position of the ears to the eyebrows)
His hair is cut shorter on the sides and left a bit longer on the top, which gives him this bunch of hair which goes over the forehead.
Either that, or he is starting to bald slightly which is a sign of age.
Your portrait doesn't take these features, your character looks far friendlier, younger and softer than the game character. Everything has been equalized so that it gets difficult to learn a lot about the character just from the face.
He has still got the same face shape and the thick neck, but the specificness of the original is gone. In the game he could've been the rebellious, secondary hero (think Han Solo) or the enemy (the young ambitious general, instructed by the evil overlord). In your portrait his role is hard to tell.
The same goes for the other characters, the original portrait of the blue haired girl suggest jumpyness, action and a sexy, confident, shrill charme. An action-girl. Your interpretation looks more carying, careful, mature, motherly - more like a healer.
Careful with the lenght of the noses on the first two, if you take anime proportions and make the eyes smaller you get those long-nosed characters.
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