Depends on what you paid?

Pay peanuts get monkeys but overall finish looks a bodged Job and hard to remedy 

My ocd would go awol looking at it

Best wishes

It looks a bit shoddy to be honest. The patchy areas of grout may be as a result of salts rising and the reasons for this can be complex. Our tiler in our kitchen used too much water on the grout, even when I asked him to be careful. Apparently this could result in patchy grout and it did indeed. I would refuse to pay in full but this can be highly stressful. You could invite in another tiler to give an opinion before proceeding. Best of luck.

Yes, I have decided to withold payment. I went to the local tile shop today where he also goes to buy materials. I didn't mention any names or identify him. When I showed the woman behind the counter the pics, she advised to not pay. She said not good enough. She also said there is no way whatsoever that the correct grout colour has been used. We think that the guy's labourer/second in command must have used the charcoal colour from the floor tiles on the walls as well. It is quite possible that they have miscommunicated on this. I have included two more pics here to show the colour discrepancy. The silver grey is the one with the green dots. The charcoal is three shades down from that. I feel better for staking a stand on this. The tiler seemed like a reasonable enough guy but I am not going to accept crappy work, otherwise what's the point of spending all that money on a major home renovation that is meant to properly upgrade the whole house? Thanks again for the responses.

If the guy's labourer has done most of the work then you surely have grounds for asking for it to be re-done. An experienced tiler would never use that dark blue/grey sealant, it's a red flag.

Too many people out there doing very poor tiling. Tiling done well is a real art. I’m glad you are sorting it out.