Would you pay this tiler?

Getting the whole bathroom remodelled. It's obviously not finished yet, the tiler is coming back tomorrow but I noticed a lot of little gaps, cracks and gaps. He will be applying grout tomorrow but I don't think at this stage it's up to a professional standard. I do most of the house renovation myself but I thought that plumbing and tiling is beyond my skillset so I thought I'd get a professional but I'm starting to doubt if I couldn't do it better myself. What do you think?