For all of them, the McD's one especially, you could use some more texture to your surfaces. If your using tiles, make sure it repeats ok
For example, you will never see a plain colour tile, especially in a restaurant:
And even in tiles that appear blank, there is in fact some sort of texture:
There is also a Tangent which is bothering me..
Here is a quick edit to illustrate my points:
(Sorry for rough work, using a mouse haha)
I moved the line down so it dosnt match the intersecting line between the floor and the wall,
And I added a subtle texture to the tile, including a highlight to pop them out a little bit.
I would suggest adding at least a subtle texture to everything else, unless of course you are going for a certain oldschool isometric game art style
- in that case I would still suggest adding highlights to make everything "pop" out a bit more.
Other than that, perspective is pretty darn good, Shading on the walls are nice - make sure to shade the stools/tables the same difference as the wall, at the moment they are a bit flat
That should be enough to start you moving in the right direction,
Nice work!
