Fantastic lighting on the second shot.
The speedlite is a dream to work with. Both your images are nicely in focus with nice shallow DoF for the BG.
I have a Stofen diffuser which is better than nothing. I also have a white reflector which acts reasonably well as a diffuser as well. Whenever using the speedlite, I always knock the output down to around -1 to reduce the chance of blown highlights for other types of images.