I agree with jenniffer. I do, but I fear they probably get cropped out the way I position them.
I used to get upset about people copying, but in all reality, what can you do? Unless you copyright your designs (expensive!!) or have the money to sue, you just have to get on with it. You can ask nicely to get them remove, but most (in myexperience) are quite defensive. Is it wirth the hassle?
Most photo “thieves” aren’t in your area, or country even. Life’s too short!