Those iron bars definitely need some variation. Not sure if this would work but moving some of them a little upwards and downwards is worth trying if you haven't yet. Rotating some of them could work as well.
The bars are rather widely placed, and one seems to be missing. Also, they are almost always black, only occasionally painted to match the color of the wagon. There is often a horizontal bar at the midpoint.
The details look to be sculpted in your normal map, but are flat in the renders.
Looks pretty good. Right now there is obvious repetition on the vertical bars. You have enough room in your texture to make several unique bars. Then flip some of those vertically and rotate to break repetition more
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The details look to be sculpted in your normal map, but are flat in the renders.