Ooo! Ooo! I have lots of archery reference! (because there is a LOT of archery in my comic.)
I don't have anything that matches your exact pose up there, but these are probably my most relevant bits of reference if you're looking for a pose that says 'I'm not at full draw or pointing an arrow at anyone YET, but I'm ready to draw if you give me a reason'. But there are a LOT of good stock photos for artists doing action poses out there.