A friend from work agreed to be my model while I test my new speedlights. We got a coupple or really great shots, I'm super happy with the results.
But I also learned not to trust the picture on the back of my camera but instead to use the histogram. Many of those photos were quite underexposed and I had to bring them back in post production. But thanks to the high dynamic range and because I'm shooting RAW this was still possible.