Mal, it looks like a plan.
In the Osprey photo, handhold stenciling is noticeably absent. Most photos of Luftwaffe a/c in winter paint have it on the upper surfaces only, so any normal underside stenciling is probably going to remain intact while upper surface stenciling is likely going to be covered as a matter of convenience. Wyllie depicts the yellow octane triangle on the upper port fuselage (just aft and above the upper rear corner of the kommandeur's chevron) as remaining, however.
Using the photo as a guide, the whitewash is VERY matte. Luftwaffe paints from the period are typically satin or a semi-gloss on the side of matte. Just something to keep in mind.
One very noticeable thing on the Wyllie painting - mud staining on the wing root.
The fuselage crosses may seem like they were misted with whitewash, but that is more likely the green (RLM 70 or 71?) or gray used on the fuselage balkankreuz as a low-viz measure late in the war.
Another thing that seems to be missing on the model photo you're using as a guide - the yellow Hungarian front chevron under the port wing that wraps around the upper leading edge. Wyllie also depicts this in his painting. A good example of this marking (a recognition aid for German ground forces to avoid shooting down low-flying friendlies) is on the National Air and Space Museum's Fw 190F.
And if it can't get any more confusing, Wyllie depicts Hartmann's G-14 with a single recessed trim tab on the large tail instead of the two tabs standing proud of the rudder trailing edge.
Also, the dorsal DF loop fairing WITHOUT a loop is depicted by Wyllie.
That's my US $0.02 worth.
HTH