Is there an easy way to attach a picture to email?

I know I can easily share pictures when I'm in iPhoto, but how do I attach a picture to an email already open?

I click the paperclip icon, then photos, and I'm shown my iPhoto libraries icons. If I select one of those, it attaches the entire library to the email. How can I simply browse and then select photos from within those libraries?

I've also tried dragging an image from iPhoto into the open message, but all I get is the file name with no content.

I'm used to Windows, where I simply open a folder and select one or several images to attach. This apparently doesn't work the same way.

Thanks for any help.

Stan