Photos look good. Right where you should be for 4 weeks.  I don't think you'll have any trouble growing a great beard.

Also...embrace your grey. It really looks quite striking. Have a browse through the forums and you'll find a good many fantastic beards with grey streaks and stripes and spots, and every one of them is unique and stunning.  I've yet to see a beard with any level of grey, even completely white, that doesn't look fantastic.  It's just a very cool way to break up the color and add some interest and character...

I love my beard, but that is the one thing I almost long for...more distinct grey. I'm sure mine will turn more grey as I age, but grey streaks make me jealous...