In addition to adding more rubble and dust and dirt around the scene, the comment about the T-34's steel road wheels being uncommon in Berlin focused my attention on the tank and caused me to do some after-the-fact research. This brought out a significant issue with the historical accuracy of the scene. I built the T-34/76 a couple of years ago and have had it on my shelf. I only later thought about incorporating it into a dio of some sort and came up with this. I think it looks OK, but it's really too early a version for a 1945 setting, with the 76mm gun, '42-'43 turret and steel wheels. The pictures I've seen of T-34's in Germany universally show later models (T-34/85) which only makes sense given the massive levels of production and attrition of Soviet armor. I suppose it's possible a mid-war tank could have survived 3 years of combat and made it to the end, but it's really not all that plausible. It's easy enough to swap out the turret and wheels to make the final version more consistent with the 1945 photographic record.
As for the comment about the tank crew and infantry being oblivious to the surrendering German, the camera angle from the pictures makes this hard to see, but when you look at the dio in person, the German is actually out of the sight lines of all of the Soviet troops, at least for the next second or two. I had tried the scene with a Soviet out in front of the tank, pointing at the German and shouting back to his comrades, but ultimately dropped that element because I liked the idea of these soldiers being surprised (and a bit careless for not checking their corners) by the surrendering German.
So, I'll post pics again after I've enhanced the destruction and grit, and once the tank has been updated to a more plausible production model. Thanks everyone again for the great feedback!