Yes they are JDs,
below a couple JD natural habitat videos. Eden2
above the majority of cichlids you see are JDs. Other fish are Rhamdia catfish, and mollies
Below, they share habitat with Mayaheros uropthalmus, and live bearers 027 zps4b102ffd
Looks to be male to me, although what you really want to show, if trying to gender ID Rocio, is a close up of the jaw, and its under sides. Females have a lot of blue, males don't.
Even after I edited your pic, its hard to tell because the lower jaw doesn't have enough light, and clarity.
A pick with something like this angle would help.
Hard to say for sure. In these pics it looks like it might have a females beard coming. My male JD has some color in the beard and the beard on him was more pronounced when he was younger. Heres a current pic and he still has a feint beard.