First of all - look at her belly - I know that people often tell us that their fish is full of food, but having had Cichlids for years and years, there is no mistaking a female that is full of eggs. Your fish has that look, and she is pretty rounded in appearance. A male has a more masculine face, if that makes sense. More "muscly" At this size, a female's head looks pretty much like what yours looks like - a male would have a more defined nuchal hump. Both sexes can have the long flowing fins. Enjoy!