Hi Gary, nice to meet a new member--"Welcome" to the forums!
Now to your dio...first, a nice job beating up the StuG; the weathering on the top hull is nicely portrayed, and you did a nice job mudding-up the suspension. However, that much mud/dirt is out-of-place in this city setting. That much mud/dirt would undoubtedly rattle off while clanking down a cobblestone street, dontcha think? This StuG would be much more convincingly displayed in a country settting, on a dirt road or in a field, where the tracks would be complimented by the groundwork.
If you really want to get nitty-gritty, why would there be mud on the spare wheels? That seems excessive, IMHO.
THe building is beautifully painted and portrayed--love the lamp!--but the whole scene looks unfinished because its too clean. I agree with the adding of more street debris, and it definitely could use a figure to add human interest and scale reference. A soldier or two would really add dimension to the scene.
The back corner of the building's inside could use either more debris, or furniture tossed around. It's a bit barren as well. Take a look at the destruction and composition of this little 1/72 dio; there'a a lot of debris that gives the scene a feeling of "war"...
Can you spot the three figures in the scene? Note the diverse selection of debris--bricks, blocks, wooden beams, and lots of dust and small pebble-sized debris can act as "visual mortar" to tie all the debris together
Anyway, I hope you don't feel as if I've "torn your dio apart"! I'm definitely NOT a "rivet counter"! It's all in the spirit of encouragement/improvement!
I would first rethink the amount of mud on the suspension and wheels, or maybe place it in a rural setting... Hope this helped!