Here are some great sites for you!
Mona do you mean wishing well for a yard decoration? If you type wishing well in the search box and hit enter, you can find more. I chose a few for you: https://www.hometalk.com/9014156/how-to-make-a-wooden-garden-wishing-well
Start with the color that you want to use a maybe accent the whole wall a color to offset the room then maybe start with a large picture of something that you want there and then maybe do a shelf with some accents on it to accent the woman some greenery and then go from there
I would power wash it.