How to tell sex of Red Eye Tree frog. I just have one

[tommyboy]

I only have one Red-Eyed Leaf Frog at the moment. I want to get at least one more of the opposite sex. I am not sure what sex my current one is. he/she is about 10-11 months old. he/she has never made a noise that I have heard. it seams smaller than other females that I have seen. so I am totally confused. are there other indicators of sex that I can go by? I have hear that you can tell by the nose angle. is this true?

I took a few pictures for reference.

Thanks for the help

Tom