1st pic: very good overall, but if it was larger i think you could add more detail to the face.2nd pic: nice clothes, very bishonen style 
3rd pic: really nice. but i think his feet should be facing left with his body. like the pants.
4th pic: heh cute, maybe too many blush lines but i like the elfish ears.
5th pic: this is pic is GREAT! really nice body and attention to detail on the clothes. great looking weapon, but maybe his face could use more work. he seems maybe a bit shy and a tab laid back for his body which looks like he wants to fight. also i think the left boot is a little thin in the middle.
One the whole: nice set of sketches. I'd like to see some coloured versions. 
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"Oh my sweet revenge. Will be yours for the taking.
It's in the making, baby. a-a-a-a-h." -Revenga, System Of A Down