My first instinct was female from the head and body shape and dorsal fins but I've added a picture to show what one of my males looked like - the best way to tell IME is the vent shape. If narrow and slanted back like the pic below, then probably male, if it's fatter and points more downwards - then female....hope this helps...
and the pink belly is an indication on blue rams, not bolivians

and the pink belly is an indication on blue rams, not bolivians