He still looks too old, imo. Like,
elderly.
Average age of guys in ETO, IIRC, was about 23.
Showing the "horror of war" on his face needs to be mainly working with the expression, and very gentle use of color. The gross anatomy needs to be correct for it to feel right, imo.
And... meh... in practically every photo I've seen of GIs in the field, unless they were in a static position, they got tanned and sunburned, and they were really dirty:

(note: this is in PTO, not ETO)

(not: this is Korea, but it's still fall / winter, note the mud)

ETO, looks like the period after the Bulge.

This is one of the classic photos of the war. Note that that's a fairly young guy there- maybe mid-twenties, no older than thirty. He's out in the real war, where guys did not tend to shave a lot, except for maybe Patton's crew.
The image of the bearded soldier was so commonly seen as the real way it was, that the comics soldiers read show the typical "dogface" with a beard. Even though it's winter, and even though it's B&W, we can clearly see that his skin's exposed, darker than it would be if you were just indoors, etc. Maybe experiment with a beard.
The pasty-white GIs in Bocage fighting photos (unfortunately, most of the really good photography I was able to find during my cursory search are from that first bit) are newbies, and you can tell. They have all their kit, netting on their helmets, and many other details that would have instantly marked them as replacements later on in ETO.