There is no way you can determine an ascendant sign by looks alone. Robert Downey Junior, Johnny Depp and George Michael all have Leo rising, but then so does Elton John and Barry Manilow, purportedly. See what I mean? Marilyn Monroe, Katie Homes and Meryl Streep have Leo ascendant...And then there's me... I don't look anything like any of them!
Also, I too have a pisces moon and used to think I had cancer rising for that reason, AND I am very maternal, at least where babies and pre-teens are concerned, but how much of this is biology and how much is in the signs we are?
Have you tried dowsing it? Only problem with dowsing is that if you have any subconsious beliefs or preconeptions it will translate through the pendulum into the answer you receive.
So what do you believe, and why? An asendant doesn't define you - the beliefs and options of others can encroach on what you believe yourself to be, but what do you believe and why? Here's what I think - Leo - self-aware, strong, direct, challenging, stubborn, passionate, confident, generous, self-centred. They prefer to give orders rather than take them, at a push, but basically they hate being told what to do, like all the fire signs. Cancer - Indirect, reflective, emotional, bubbly, moody, creative, changeable, imaginative, clingy, emotive, nurturing, often value themselves more through their relationships, partiularly family, for good or bad, rather like Libra can. Which desribes you the best? But you will have your own opinions about what the signs mean. Don't forget you can be both signs in sidereal and tropical systems, which may mean you don't have to reach a decision at all! Good luck and namaste!