Close up of floor tile

Another view

Does your espresso cabinetry have any red in it? Just asking because I almost went that direction and switched to black, because everything I looked at drew out too much red in the cabinet maker's stain.

Where will your accent tile be used? If it will be at all close to the granite I would avoid a busy granite or quartz.

Very pretty tile choices, and I agree maybe not too much grey. You really should just take the samples to the stone yard and look at the slabs. There can be so much variation among slabs it can be hard to make a recommendation. Try to take a couple of samples home and try them in your light too.