My OCsona and this guy’s for the collab.  
Since I knew that no one else would make any sort of siren for the collab, I decided to species swap my OCsona into a half-siren to fill that quota, and I stuck her on the green guy to kill two birds with one stone and make a metaphor. Whatever that metaphor is is up to the viewer. I also tried to be careful to have their heads on the same relative plane so that most of them can be more easily covered up. I’m usually good at being simple with vectors for these collabs, so I got a little creative this time, sorry. :v Also had to give her a plushie to match my fave I own IRL.  
I made her fins and tail black and orange because it looked the best, was the most ‘natural’ for her colours, and it matches some IRL fish. Green guy is the same as always. I’ve also arbitrarily design that half-siren pegasi don’t have special wings, but maybe this doesn’t count because magic. The glowing necklace is what changed her form. :v  
Anyway I fully expect to be told “this is too much” and if so, oh well.