Third picture : ) I like it small, i like the boy look.
Little kid with big boy parts
Personally i just enjoy the "Boy" aspect of guys ahaha, Playing int he mud, running around all the time. Just don't care what oth ers think. Its how it should be. Plus short hair looks hot. You could even go a bit shorter then that.. do something with your bangs - just take them off your forehead
I also kinda like your last picture ahaha.., however go with the short, you can't go wrong.