a man wearing a red jacket and camouflage pants is leaning against a giant tree in the snow.
A lumberjack poses with a tree he's about to chop down
You can not infer it's a lumberjack.
The man might not be a lumberjack.
To lean against is not the same in exact meaning as to strike a pose, because to pose means to position one's body in a way so as to achieve a certain effect; there are many reasons and possibilities that could cause or occur as a result of leaning against a tree and chopping a tree is only one out of an infinite number of possibilities.