Yes, Alix is very pale and very girly. He's supposed to be. Although they're both human, they're different races of human within the Elder Scrolls universe. Martin is an Imperial - the dominant race in Cyrodiil, average height and weight, light brown/olive skin, brown or black hair, based on Roman culture. He's also the heir to the throne, but he goes around in the same beaten-up robe that he wore when he was just a priest: partly in rebellion, partly in denial.
Alix is a Breton - short and slender, pale skin, red or brown-haired, part-elven (which is especially apparent from his ears), high degree of magical ability. He wears leather armour most of the time even though he's a mage, because it offers more protection than mages' robes. (As well as causing slightly fewer people to mistake him for being female).
The artist who drew this picture, Memai, tends to draw Breton men as fairly androgynous, which fits Alix very well. Here's her commissions page, if you're interested - very reasonable prices compared to what a lot of fan artists charge!
I love the expressions in their eyes. Alix is all hopeful: "Hi love, I just returned from a mission, would you like to come to bed with me? Now?", and Martin's saying "oh hell, I was concentrating on some work, but now I've forgotten what I was doing and ... oh!". Hehehe.