Originally posted by robgski @bobphoenix Very clever idea, and if it was less than perfect in execution, it is a great start.
Did you use the in-camera multiple exposure feature?
Not knowing your process for this photo, I'd suggest starting from left to right in the frame, using a brief use of a strong white light (a flashlight would do) on the subject, to fully illuminate her, then paint the halo. Have the subject then move to the right and do the same process. That should result in two strongly and equally lit subjects with the light painted additions, but everything else remaining dark.
I need to stay up a little later or get up earlier, put on a warm jacket and do some more outdoor light painting.
The technique I employed for this image is pretty close to the process you described... Except that for the illumination of the subject, I used a self regulating speed light set to minimum light output. Oh, and the camera was set to "B"ulb.
I haven't really varied much from my 35mm film days of light painting...