Here is what I had shown my contractor initially. And additional photos of the boxed out window.

A flat trim detail that is integrate the roof edge and effectively "shingled" into the water management should be fine. Obviously there will be a gutter on this addition.

If it were my design, I would have wanted to extend the roof above to extend out to create an overhang over the bumped out window. This would aid in waterproofing, help keep the window clean on the exterior, perhaps offer shade from the sun, and look better.

The window is completely under the projection of the soffit and should work fine, although it looks like the flashing and house wrap installation details aren't right.

looks like the flashing and house wrap installation details aren't right.

Like flashing windows with micro-perforated housewrap.

Agree with those above. I would have done something similar to this.

It appears that extending the roof might have required one or two additional downspouts and perhaps a drywell or drain under the pavers. IMO you're better off keeping the roof configuration and payig more attention to the flashing.

Will the cladding on the front and sides be Azek panels rather than siding? If so, that might reduce the potential for water intrusion characteristic of low grade (house brand) perforated plastic house wrap. It would have been better to cover the entire bump-out with a self-adhering flexible flashing. Of course, it would also have been better to use Tyvek.

What you had shown your contractor initially has a larger roof overhang above the window than what appears the builder built above the new boxed out window. I could be wrong, it is not totally clear in the images.

I was going to search for a picture similar to what Beth showed you. That's what I'd want.

Just walked by this: