It's ok now, it's because I put the images 2 level deep from the project file.
If it's a sub folder that put in the same folder as .scml file, it is ok!
I just tried it and it works on subfolder images, even if they're more than one folder deep. What platform are you on?
BUG: right click on image don't show switch box if it's in sub folder.
I try to put diffrent body parts in sub folder to reduce images that show in the switch box,
but it does show if this image is in sub folder...