At first it looked like a pretty good install till I got to the last couple pics. Shingles should be step flashed in a wall not installed with what looks like track flashing. This will not work. Flashing is a two part equation, you have step flashing on each shingle course then counter flashing that covers the top edge of the step flashing. This really isn't rocket science, they print the instructions on the wrappers of the shingle bundles. If they try and tell you this is the way to flash a wall, tell them they are sadly mistaken.