Here is my GT, he/she is about 3-4". I am not sure what sex it is. She has the forehead and fin coloration of a male but her fins are rounded like a female. I am leaning towards female but am not sure.
I'm going against the grain here and say male. The picture shows the coloring to be bluish on the side which to me (aside form venting) says male while females tend to have more dull gold kind of coloring. I know yours has a lot of facial stripes which could indicate female but the light blue tint seems to be more accurate in the scales, at least for me. Post some clearer pics to be sure.