It would also benefit the piece a lot if you gave some tridimentionality to the floor tiles. You highlighted them all around to show that the borders are beveled. However, at this perspective you could give the viewer more hints that the tiles are on the ground, so it's best to not show the northern (upper) lighter bevels of the tiles, since the perspective would hide them from view.
Also, this is optional and just a trick, not a geometric error, but floor tiles work better when they are wider than taller. As eishiya often says here, floor tiles can truly be of any shape, but as we are used to see them in front of us at an angle from above, them appear squashed to us. If floor tiles are wider we recognize them more easily as floor pieces, as distinguished from walls blocks, but this definitely not obligatory, just a trick to help the viewer.