Lights!
I've been working my way through Zack Arias's Onelight 2.0 workshop and ordered a lightstand and 150cm umbrella on the strength of it. They arrived today and I did some practice shots of Freya this evening. This is with the SB800 shooting through the umbrella. I have a lot to learn and I expect the curve to be steep, but hopefully it won't be too long before I'm getting the hang of it and am getting good results!