That is a great picture to illustrate the depths of inbreeding in convicts, it portrays every known visual way to ID a male or female in the same fish. It looks like a male to me, since it's more uncommon for females to show long finnage than males showing a orange stomach. See if you can take a picture of the vent to be sure and post that.
Please don't take that a insult it's a great looking fish, just merely making a point on proper techniques to breed fish for retail.