On the right-hand side of the bar at the top of the capsule, you'll see some arrows. This will move it up and down in between other capsules. If you'd like it next to a particular piece of text, then you should start a new text capsule where you want the picture, set the picture to half-size, and set it there. You can also drag-and-drop on the right-hand toolbar (like where you put in tags, summary, etc.) which might be a little faster if you have a long hub and the picture has to move quite a ways.