Updated after some helpful comments by @NP5 and @Zangk.
Cheers!
Nice brick colour variations.
I like the size of the brick and its colour.
I would suggest making the axis bigger, and making the crank larger. None but the smallest of hands could crank it with ease.
Oh ya, nice rope 
All good and helpful points. Many thanks.
The axis was actually the mistake I made when I was first making my well :), it was also @NP5 that corrected me 
My mistake, your benefit.