Overall I really like this shot! It is dramatic and eye catching.

For me, the tree is perfect in the lighting it is in. The focus is the building IMO.

The main problem for me and this is ALWAYS a problem for me (in my own shots and critiquing others) is the brightess of extraneous elements.

In this case, it's the white cloud. My eye immediately goes there and it's not the focus of the shot. The dramatic sky is GREAT, it's just that white cloud. Personally I'd tone it way down through burning or cloning. I might also lighten the lower part of the facade of the building just a touch. Aside from that the building is 'leaning' a bit to the right and I'd also fix that in PS.

Hope that helps,

Marko