Taking screenshots is not my cup of tea, and I don't like to spend much time using posing mods and get the best angle for showcasing; I rather play and, if I spot a good place for a screenshot, use an idle or a simple pose mod (FNIS based) and take a couple of crappy screenshots just for display the armor conversion.
That is why I like this Auto Killcam (from vagonumero12) a lot; some of the best poses are with weapons drawn but sadly it was almost impossible get good angles using tfc (free cam in console) while in kill move sequence.
This mod takes automatic screenshots while your character are making a kill move and the result can be something great to showcase. Just make sure to check the data\killcam folder and select the best and delete the useless ones, as the folder can become quite big. Highly recommended.