I actually like the 2nd one though. All three of them are good. But I like the 2nd one just a bit more. Coz the character pose in no. 2 gives me a feeling of movement compared to the other two. That in a way, gives the work a sense of dynamic and also gives the character more personality. IMO, in the other two sketches, it is as if the character is just posing for the camera. But then again, I'm just judging from the sketches. The finished work may give me a different feeling after the colors and the details come into play.
Otherwise, your sketches are really good. I don't think you can go wrong with any of them. Looking forward to it!