Hi Donnie.
To my knowledge there are no photos of Fenten's Yellow 6, but in my view it is a very fair bet that it would have looked very similar to the other G-2/R-6s of 6./JG 5 at the time.
As is well know they were finished in the special scheme of 6./JG 5 consisting of RLM 70 dark green and white "blobs" over either a standard grey scheme or in some cases a desert scheme. One example of the former was Rudi Müller's "Yellow 3", see profile and photo below. Markings would also be similar, except for the numeral, of course.
Hope this helps.
Best regards,
Kjetil Aakra
P.S. It would be great to see your paiting whern finished!