Hair Extensions Help?

Hi everyone! I am new to hair extensions but I feel like my install isn’t very good? I’m seeking opinions before I decide to stick with my current stylist or switch.

I had the extensions installed for almost 3 weeks.

Edit: I’ve been taking minoxidil for a few months now and I have seen some short hairs around my head. I’m also wondering if those hairs/white spots around the extensions are breakage, new growth, or just dirt lol.