Reference Image
My creation

Any mistakes I made? Any ideas on how to improve?
The front side looks nice for a beginning and this experience will help you progress.
Your house need reflection for the outside part and I think the wood planks might need another texture
Your roof should be lifted higher and extended out beyond the building to create eaves on the building. That should also make being in the building not feel cramped upon entering. The roof may look better if it’s pitch is rotated one more time. The lighter blue parts I think may be some sort of siding do not line up on the front to the side of the building. As already stated the wood section does look a bit wide compared to your reference. Great start and pretty good.
Some parts are overlapping and out of place, and as someone else said the front is slightly too wide.
But apart from that, I think you’ve done a really good job.
As someone who can’t build houses, I think this looks very neat. If you improve from those feedbacks, your build is gonna be :chef_kiss: