I agree. I love Marth's clothes and his headband + Hair, but his face doesn't feel like his. His expression isn't inviting and warm. In other words, Marth doesn't look nice.
http://serenesforest.net/fe3/char_2.html
Comparing it to his FE3 sprite, you can sort of see what I mean.
Also, why'd you decide to go with a blackish color for his clothes? It looks nice, don't get me wrong, but I'm just curious.