The exterior of the building itself is really nice and modern. Maybe consider adding a skybox to th cafe to get it a nice feel to it. The terrain seems to lack detail. There is very little detail and you can make it by better by adding benches, plants pathways trees, etc.
The cafe looks very well put together like the lights placed underneath the overhang roof, it gives the place a very nice feel however I feel like the cafe is missing a couple of features I feel like there could be some exterior seating. The exterior looks pretty nice, you could add some chairs and tables, try placing some table decor onto it like a small potted plant table cloth cups something like that could work.
Your terrain seem to be empty. Since your going for a modern-low-poly design, add some terrain objects like grass plants maybe a few trees on the mountains. Modern can be achieved in many ways, and simple changes like these will improve your build. Nice build.
Asking for prices on my build isn’t allowed I would recommend editing your post so other people are aware.