Hi Johan,
I presume this is one of the photos you're talking about.
This is a well-known image of Richthofen visiting Jabbeke in an Albatros D.V. This was probably the aircraft in which he scored his 57th victory, and the one in which he was wounded on 6 July. It was definitely taken
before 6 July. The tail section,struts, wheels, upper surface of the wings and just the prop spinner and metal cowling ring behind the spinner were red.
But this is, I think, the other photo that you describe.
This is an entirely different aircraft and occasion. This is an OAW-built Albatros D.III. It displayed the Jasta 11 unit markings which only came into use (in my opinion) in the later summer/autumn of 1917. The entire nose from the spinner back to the leading edge of the cockpit was painted red, along with struts and wheels. The OAW factory continued to deliver these OAW-built D.III's even after the D.V's had been at the front some time. For instance, the Seefrosta used a batch of D.III (OAW) that were delivered in October 1917, and others that arrived in December 1917.
It's my opinion (and that's all it is) that this photo was taken
after MvR's wounding and recovery, sometime in Sept-Oct 1917. I think he was just using this Jasta 11 Albatros D.III as a "traveling machine" of convenience.
So, make of that whatever you want to!!