Don't expect too much too early. You can work on the jawline better by using skin-stretching to move the skin around, pulling the skin near the jawline up and then down so it is easier to get at it.

As for the neck area, I've learned to not worry too much about getting it perfect for the ATG passes there can be difficult. I'd go for satisfaction with this area more than for perfection.

The "little dots" are referred to here as "weepers", and, in my opinion, come not from pulling whiskers out instead of cutting them but from trying to get the area too close, especially with ATG passes. I can get that area very close with ATG passes but usually settle for close enough with WTG and XTG passes.

Don't try for too high a standard. It's your shave (and your face). Do it the way that pleases you. As your skills develop, you'll find ways to improve your shave. In the meantime, experiment and enjoy.