I love the way Patty and Black*Star are akwardly sleeping on the floor (well, partially, in Patty's case) And how Kid is sleeping in a symmetrical manner, Tsubaki looks peaceful, Liz is just dealing with Patty and Soul and Maka are just.
The top one is Crona's sex so it's what he biologically is. Gender is what YOU process as. Crona has never clarified for us so yes it is unknown. Either way Crona is still my favorite. Right above Kid.