At first glance I sure thought pullet, but I'm really not 100%. That comb looks a little large, and I'm not sure those aren't saddle feathers coming in. Looking again, I'm leaning toward pullet...sure hope that's right! I'd love to see pics again in a month or so, or when it crows or lays.
I see your dilemma! I'm on the fence. The tail is the only thing that makes me think rooster. Those are such dainty legs... I'll go with the majority and say hen!