To properly "Guess" at the sexes, the fish need to be at least 8 months old and a body size close to the size of about an American 1/2 dollar coin. If your fish are close to both of these, please post larger pics of the fish highlighting their Belly/ Anal fin areas and if possible, a frontal view before feeding them their first meal of the day. I can be a bit more positive from these views.
If they are younger and smaller than this, the correct guess rate goes wayyyyy down
Hope this helps.