When I drag a picture in the box where I write it apears here.
After I pushed enter, the picture will send to my partner.
Now I see the Picture between my messages like the photo I took.
Is it possible that my friend see this in his message, too?
this depends of your friends messaging client...
I don't know about any messaging client that can do this, but it shouldn't have to be THAT difficult...
It is posible if your friend uses Adium X too or another client capable of drawing images in the message window. iChat can do that, not sure about other clients.
iChat shows the picture right? I thought it was a feature of AIM's Direct Connect, from what I've picked up here; but then I rarely use AIM so I'm not entirely sure. So my guess is it would depend what service you're both using..