When you lift the tail like, holding the dragon in the palm of your hand with the head of the dragon resting on your middle finger, you can slowly swing the tail side to side to reveal the bulges of the hemipenis. You lift the tail with the opposite hand, thumb under the tail with the index finger helping the bend on top. When it is male, the bulges will appear and kind of recede with the side to side movement. It can take some practice with actual males to see the difference.
Also I tend to see a upside down V in the case of the female bulges, while it is not ALWAYS the case I am cautious to claim definite sex if a female looks like these pictures for fear of the opportunity it becomes male.
The pores on the back legs look more male (pic 3) than female also.
I will say I find it much easier in person rather than by someones picture, video I suspect could show more conclusively.
Jeff