Just study it a lot directional/dramatic light is something that I strive for in every photo. Lisa Holloway is my hero. I wish I could spend a day with her!
Well I can tell you have put the hard work in cause your lighting is just beautiful. I got so stuck on always shooting outdoors that now when I am indoors I like it but don't love it. I also need to get a speedlight but not saying in any way that is what makes your shots. I have seen many shots with speedlights and they look hard. You do a great job at using light but making it look soft at the same time!