Here is my barn level for a school project i have been working on, there are a mixture of PBR textures, Spline Modelling techniques and NURBS. Please let me know what you think
It's really hard to tell how effective your PBR materials are without lighting. Throw it in Unreal / Unity / Marmoset, then post the renders. Also what is your reference? Proportions don't look believable and I would revisit how the planks look on a barn. They appear to thick. Also I would recommend getting a human model in there for scale, it will really help those giving feedback gauge the scale of your environment.
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Show your references. You've built the barn wrong, it looks like.