pic was a little small but i dont really see a bump at the base of the tail, and even at 6 months it should be showing more colour if it were a male i think
I'm thinking you have a girl here as well. None the less she is very pretty! Without larger pics to look at the tail base it is hard for us to tell male or female for sure. If she were a he then there should be coloring showing at 6mo of age. You still could be right though and have a male who is just a late bloomer sometimes it happens. Get some larger pics when you can and will be more then happy to help you solve the mystery but so far as I said and many others it looks as though you have a female.