I think my photos are not clear enough

I took the shot, without having any goals in my mind. And I think it is a recurring theme there.

I think I chose the wide aperture, because it was cloudy and I wanted light coming in, in order to be able to raise my shutter speed.
But when opening the photo in the computer, I was expecting to be clear and sharp but without setting that goal in the first place, when I took the shot.

Thanks again for all your great comments.