Is this valley tile work acceptable on an older tiled roof?

[paoloz]

Hi everyone,
I would appreciate some opinions on recent roof work carried out on my 1930s tiled roof.
The main work involved EPDM rubber installation to a valley area that had been leaking. The roofer installed new lining/membrane work to the valley and lifted/relaid tiles around the area.
My concern is mainly about the tile work around the repaired valley. During the work, several tiles appear to have been broken and replaced with newer tiles, and some of the tiles near the valley do not seem to sit or align as neatly as before.
I have attached:

• two photos of the repaired valley area,
  
  
• an old photo of the roof from when I bought the house 15 years ago,
  
• and a photo of the other untouched valley on the roof for comparison.
  

I understand that some tile breakage can happen on older roofs during valley work, especially with older reclaimed tiles, so I am trying to understand whether:

• the tile positioning/alignment is mainly cosmetic,
• or whether there are any signs of poor installation that could create future problems.

At the moment I have not noticed any obvious leaks, although it has not rained heavily since the work was completed. However, I am concerned about some uneven tile positioning near the valley cuts.
My second question is about lead work around a rear chimney that was also replaced. I have attached three additional photos.

Some of the tiles around the chimney are not perfectly aligned after the work, and I would appreciate opinions on whether the lead flashing/detailing itself appears to have been installed correctly and to a good standard.
I am simply trying to understand whether the work is technically acceptable and whether I should leave it alone or be more concerned.
Thank you.