Hidden object puzzle: Can you find the prisoner in this drawing?

In this drawing, a soldier stands at the window, looking out like he is watching birds or enjoying the breeze, but a prisoner is actually hiding in plain sight. With just a little brainpower, you will be able to spot him immediately.

The room looks like an old-fashioned barracks, with crooked furniture, cracked walls, and a towel hanging limp as if some fight has just unfolded. But the most interesting part is right at the window: the tree, branch, bird, and window all seem to combine to form the face of a man.

Look closely, and you just might make out the face of a prisoner peeking out, high nose, sharp chin, every feature clear as day.

This painting is confusing, amusing, and full of surprises all at once. Just the type that makes you go "aha!" when you spot the truth.

>> See the answer here