Crazydiamond

We are currently having an extension built and I am unsure about a couple of things on our new roof. I have attached a photo. The first is where the new ridge tiles adjoin the existing hip tiles. The join does not look neat to me and looks like there might be potential for water ingress. What do people think? The second is where the 2 rooves join. The roofers have used our existing tiles for the join but you can see a diagonal line and the tiles either side of the join are off level. Am I just being picky or should I ask for these issues to be rectified?