Try to take a photo of the head on upper view. Male will have a wide head and bit slimmer body and females will have a bit smaller head but more robust body. Color and patterns doesn't really make a difference between sexes.
To me it does look like a female.
Got some of this info from a document that tropheus sent to me, but it was written in German. I have to let a friend of mine who speaks German translate it for me.