From the reference pictures it looks very good. The details are great and the color pallet works. However, I would change a few things with this build. Mainly:
1.Materials
In the first picture, the materials on the outside (i.e the poles that are “Brick” and the “Slate”) look a little bit off. Maybe change them to “Smoothplastic” or something else?
2.Empty
Both the inside and outside seem very empty. Maybe add some vegetation or more detail to the area outside the store, as for the inside it will look 100 times better with something on the shelves and the floor.
Other than that it looks great, you nailed the inside of the store and have followed the details very well. Compared to the reference image you’ve done a great job!
Good luck in your future endeavours, and happy developing