How tall are you? It's a bit difficult to see how it really looks because the pictures are sideways and I don't have a laptop to turn. Can you turn them before posting the next pics?
From what I can tell at the angle the pics were shot, it doesn't look too big but I do know that even though others might thing a bag looks great on you, YOU have to be comfortable with it. If you aren't, nothing anyone else can say will change that.
I love the HAC and started with a 32cm. I'm 5'3" and somewhat petite and was NOT comfortable in a 32cm and went down one size to a 28cm which I LOVE!!!!!!