True. Well maybe also provide cards that just show a symbol of "two aspects/souls" (however individuals what to explain it) intertwining.
I like the imagery you provided. It is beautiful and well drawn. But, (this is just my opinion) I not the biggest fan of the long hair. I feel maybe something more symbolic would be better. I would have to sit on it more to come up with a thought as to what I think could be another imagery.
This is just my opinion. Plus this is your deck.. so do what you feel expresses gender neutral the best.
But, you did beautiful work. I think the drawing you did was very pretty. I enjoy it much.