I'm not really sure, you should take another photo of Alfie with no flash, light or direct sunlight, as this one is not very clear.
However, the amount of white around the nostrils would make me think Alfie is a girl, but, as I said before, I'm not sure.
A certain behaviour/personality is not really an indication of your budgie's gender. I have two bossy females and a kind male now, but in the past I have had a bossy male and a kind female.
I hope this helps.