Depending on your Tg and concentration you can use normal TEM or SEM to detect solid particles, for hollow or core-shell polymers cryoTEM is the probably the best known way to characterise, I believe. 

Depends on what You mean 'microphotograph'? If it means: the image of topography to see some morphology of the surface, AFM will be the best. No temperature, no vacuum, no heating, high magnification, not bad resolution (5120x5120 px), scan size from 0.2 to 150 um.

Thanks for  your answers. Probably the best way to describe morphology in emulsions case is AFM , but do you know how conditions or sample preparations ?

Again, thank  you.

Just pour on the AFM table (if your AFM system requires tables) and wait until a drop spilled on the surface. After a few hours you can do some scans. However, if you want to imaging at the micro-scale, tomography can help.