Ah, those are beautiful. Well, the bigger, the better, I guess. 1280 seems like a good width, since that's the width of most resolutions. And definitely, PNG like that.
I wonder what poses we should have them, though? Front, back, side (and other side if asymmetrical)...but after that? Top, bottom, angle? I wonder if it's all necessary. Maybe it's enough to have Front, back, side, and angle.
Edit: I realized this would be very time-consuming and is very important to the encyclopedia, so I made it 10,000. How much time does it take to produce 4 images like this of a model? (front, back, side, angle) I remember struggling with the render view.