Not at all keen on the first and last.
The last looks far too natural, to the point of dilapidated and the first is definitely effeminate...borderline ga
y.
The one in the middle is plain, but nothing a lick of paint wouldn't cure.
It has a larger capacity than your other choices, ideal for storage or developing a hobby. i.e; woodcraft.
A garden shed is a must have for any lad in his early teens, interested in developing a sex life. Aaaaaah the memories.
Sheds are ace!
The middle one...