Pterano looks sort of...maniacal in that picture.

Rehearsing "Very Important Creature", is he?

Like Mumbling said, the pose looks good.
I usually do small beaks to show femininity and/or youthfulness.
The trouble I see with that is, in LBT, both young and adult female flyers of Petrie's species have long beaks. However, if Pterano is anything to go by, then adult male flyers have comparatively straighter and more pointed beaks.
But I am practicing with my long beaks...which I hope I did better with here.
The beak's still pretty short, and I think that the lower jaw ought to be nearly equal in length to the upper, but compared with your previous drawings, it's definitely closer to how Pterano's beak is shaped, so I'd say you're making progress.

I don't want to be a pain with my nitpicking, but I noticed one other thing: there's an open space in the crook of Pterano's left elbow that should be blocked by his wing membrane. Is it too late to fix that?