lens flares take alot of focus away from images I find. Nice idea author, however the tree source you have use looks like it has a reflection in it, was it taken through glass? It is a bit blurry as well.

But good idea for sure so goodluck

its a nice concept, yet the technical side needs to improve

in my opinion the lens flair is pointless and the image stands better with out it.

all so, i would use different brushes (grass, roots or tree brushes) on the mask where the tree merges with the desk and the lamp
the transition does not look good when you use a soft round brush

good luck

very cool work author...GL