I'm not sure why you comment on whether it placed.
From one photo, and forty years modelling, I can say:
It is a nicely finished model, cleanly built with good representation of colour and weathering.
Tamiya T-34 grossly inaccurate, widely-known for many year, DML obvious and available better choice. Questionable research, confirmed by inaccurate supplementary armour and inscription (markings for 130 Tank Brigade, Southern Front, April 1942; should be STZ production fom January 1942 series). Tamiya kit as presented more typical of later 1942-43 Zavod No.112, no attempt to model STZ.
The figures are good, at least, reserve further comment for clearer photos, particularly uniform details and facial expressions.
Dirama is excellent. Good composition, well posed, has drama, Very wll done. Full marks.
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There you have it. You got murdered in the footnotes.
A very picky judge with expert knowledge has just trashed you model. You are at a Regional Convention, and you're competing against the best around. Judges sometimes look for straws to grasp, trying to pick between two models. You have made it easy for them.
If competing is important to you, the first thing to address is research. You chose the wrong kit. Accuracy counts, and DML has a better kit.
You didn't know about the markings. You picked them because you liked them. I also made decals. Every set of markings has a story, because every set of decals comes from a photograph. Find the photo. I can list several books where you will see it (they are Russian, like the T-34).
You didn't know about the front armour, so you didn't fix it. There were several different patterns, unique to different factories. You believe the manufacturer, and this one looks like none of them.
If you have the photo of this tank, you will see it was green and brown. It is a rather well-known unit with several tanks wearing different inscriptions in the same style, photographed after delivery from STZ in March or April 1942. They were all destroyed in fighting around Voronezh and re-equipped with the next (fourth) version of the STZ T-34 with late style STZ turret and mantlet, without inscriptions but still carrying the tactical marking Л2-КС and a small red star. It's quite an interesting photo, one of several from the brigade that year. It was destroyed again in August and not remustered.
I know lots about the T-34, and T-34 kits, and a little bit about this unit. I am not trying to show off - it's just coincidence I know this stuff, without looking it up, because T-34s and Soviet armour are my specialty as a modeller and I'm building another tank from this unit right now. And I have often been a judge, your worst enemy.
I am being hard on you, I know, but you asked. And frankly, from what I see, you should know. Overall, it's very good, even excellent, but lack of background knowledge affected your choices, fundamental flaw, and you are dead in the water.
You have talent and skill. You have an eye for composition and drama so you are an artist. With practice, patent determination and a good library you can build a model that can win nationally, IF YOU WANT.
I don't believe in contests. (I got censored!) like me pick apart every model, crushing everybody's ego, and at the end of the day hardly anybody goes home happy. There can only be so many winners. I don't go there anymore.
They destroy the joy, too, because you start building to meet other peoples' expectations, and you never can. You always seek a higher standard, and you can never reach it. Soon or later, you either beat it or it beats you. Contests. Competition. A slippery slope in this art form.
I hope my comments are useful. They are meant to help.
Regards
Scott Fraser