Since I can't hope to GPOSE again until at least Friday I'm going to show everyone my "super top-secret really great lighting portraits" that take 10-20 minutes. (depends on the pose really) This is made with the intent for you to try this with your own characters as many times as you want as often as you want. DO IT!
Step 1 - Have a character that can access the Malestrom Barracks in Limsa Lominsa. If you are using CRIMES it can be any character then you may load in the one you need. I have Durafein enlisted in Malestrom for this reason! Step 2 - stand here.
Note: If your squad is meandering around just make sure you hide them with the gpose character display settings. Sometimes one of them will take your precious real estate!
Step 3 - Ensure it's daytime so the light is shining through. The best light imho is around 6am Eorzean time. But any daytime works well for this. If you're not using CRIMES you may have to stand around and wait. It's worth it though! Step 4 - When the light is right strike a pose and get into gpose!
Note: If you're in vanilla make SURE you have "stop time/weather" checked or you may have a bad time! You can do that by hitting the 5th icon on the right at the top of your gpose window. It should have an image of a clock and a sun with a lock beneath them.
Step 5 - Zoom in and rotate 90 degrees or so! Sometimes I do 120 but you get the idea. I usually refine this a bit with the CRIMES camera.
Ta-da! You have a super fast portrait! Notes: You can get your character to look at the camera by selecting the "Track Camera" (second eyeball icon) under "Motion Settings" (which is the walking icon just beneath lighting settings) I literally don't touch the gpose lighting settings for these because they're meant to be fast.
I refine things in shaders but the above is just my usual "gameplay" shader so you can see what you get without drastic adjustments! Here's the portrait I've done of Viedyn using this - and Here's the portrait of Durafein! I can't wait to see what you create!