Does this marble installation look ok?

Before you guys jump on me, I bit the bullet too fast by looking at this pretty mosaic tile and ordered it for my guest toilet. We’re a household with no children, one dog, and barely any guests. We recently installed this new marble on the toilet and curious what do you all think about the quality of the work? I am wondering if I should ask the contractor to regrout the floor? Also, how will I know if they sealed the floor properly or not? Any way to check that work?

Not trying to withhold payments, just trying to make sure we’re doing the best we can here.