[mtr33]

I can't find what I'm looking for re right wrist bend.

Somewhere in my mind it has been imprinted that the right wrist should have constant bend from fix to low point.

I'm not sure if I understand your question correctly, but imho the right wrist bends "back on itself" during the backswing, so at the top/end it is at a right angle to & under the left arm/clubstaft plane. Due to the body's restriction it cannot bend any further (without arching the left wrist as well). The extra bend apparent from both pictures is caused by the camera angle (capturing a 3D position in 2D). If you look at the same swing position DTL you'd see the right wrist angle didn't increase. Take a look at Sergio Garcia and you'll see that what appears to happen face-on doesn't when viewed DTL. What can increase in the downsing is the left wrist cock.