Upload & Sell: Off
Here something i shot last year, was really a run and gun setup, really cold night only had 10 mins to setup and shoot, this is what i got... setup was 2 softboxes camera right and left (ab800 in a 30/60 softbox) and 2 yongnuo speedlites bare as hair light. funny enough this shot my flash on the left did not go off, surprisingly the right threw off a lot of light. If it was today i would have shot it a little different, but it worked well enough for me.
Just practice! id recommend some type of rim or hair light, really helps separate the subjects from the background whether that be black or white backgrounds and of course outside. get your flashes more to the left and right of the subjects, they do not always have to be directly infront of them, below is your diagram, but i made some changes on what i think would probably look better! if you could get one more flash for the rim/hair, does not necessary need a big softbox, but consistency between the two hair lights is always choice. And if you did get another octabox, id use the 2 octas as the main and the softboxes as rim/hair light! cheers!