Guessing first! Solution comes later ;-)

This turned out as an easy one! =D Congratulations to all who correctly guessed this a matryoshka doll! Time for some technical yada yada...

Camera details
Camera: Sony Xperia Z1 Compact mobile phone F5321
Exposure: 1/32 sec.
Aperture: f/2.0
ISO: 320
Focal Length: 4.2 mm (28 mm equivalent digitally zoomed 1.3 times, which then turns it to ~35 mm equivalent)
Lens: Clip-on macro lens (magnifying glass).
Editing: Snapseed

Other shots