I agree and that's exactly why I said "and/or" hump and added the qualification that "hump varies between individuals ime"-- trying to cover my tail on that point.
I've had big, older, dominant males that didn't develop what I'd call a hump, but they did have a more prominent, steeper sloped forehead than the females. At least that's my own experience and pretty consistent with what I've ever seen.
As with size difference, head shape differences are more evident/easier to discern when you've grown them up together in the same conditions/same food, and easier to tell in person, compared to looking at photos of fish of varying ages, with individual differences, etc. Females having shorter or more blunt looking fins is usually one of the earlier things I notice in growing them up. But-- this difference assumes absence of fin-nipping, so not foolproof. IMO color differences aren't reliable as far as comparing green terrors from different sources, in different tanks, different water, different food, different lighting, photo quality, etc. But you can compare males and females in your own tank, from the same source etc.
