If you like a faster way: just press Ctrl+S (for more info check Skype shortcuts in the new version).
Clicking this button, you take a picture of the person you are talking to, but the picture will not be saved to the snapshots gallery as in classical Skype, but will be sent to the chat (as if you sent a new image to your friend). To prevent this:
- Make sure that the chat window is closed (i.e., messages are hidden)
- Take a picture and click it (most importantly, do not click the "X" to close)
- In the upper right corner, click the "ellipsis" (three dots)
- Select the option "Delete" (of course, before that you can save the picture)
By the way, because of this behavior, some users complain that Skype automatically takes pictures that can not be deleted. So, if you see in the chat your photo, and you did not press anything, then your friend photographed you (maybe he did it intends, or out of curiosity to the "incomprehensible icon").
And one more thing: by default Skype will "photograph" your friend and you. Therefore, if you do not want to, stop the camera before that.