I don't really know much about severums. But in general if you post a few good pics of your fish, if it is at a size it can be sexed, the fine people on this forum can tell you what you have.
if you are talking about rotkeil severums eveything i read points to the markings on their faces as they mature. Males have the worming all over their faces while females have less and their gill plates are a smooth solid color. But im no expert either it is just what i have read XD
It's hard to say from those pics, but I would say male B/C I think I see worming on the face. That isn't a fool-proof method, but IME, a fairly accurate one.