Botox is a great injection for the Crow's feet which are the small lines of movement around the eyes. Botox does not work very well in the area under the eye. Without seeing your "before" photo it is difficult to give you a real opinion but it does look swollen. I would suggest you return to your treating physician and if they cannot help you consult a board certified cosmetic dermatologist.
I suppose you are not smiling on the attached photo, and if this is the case, your crow's feet is what we call static lines, which unfortunately do not respond well with botox, though repeated sessions (every 3-4months) may improve the appearance of the lines after several sessions.
The puffiness under the eye may be caused by relaxation of the muscle under the eye due to the botox injection which may have allowed the puffing out of the fat pads.
This usually improves as the effect of the botox wears off.
The static lines under the eyes can be improved by laser resurfacing or chemical peel.
You may need additional fresh mixed units to the area in question?? Best to return to the injecting doctor...