Indeed there is. Only problem, the picture will need to be already on the internet. 1 way to do this is to sign up to an online picture gallery. Save the pictures there. There are several about. I'm sure someone from here will suggest 1. Save the pictures there. Once saved, right click on the image you want to post, and highlight the url and copy.

On here, on a new message, you click the image icon, then paste the file name in the box that appears. then click post reply.