Could be, it is hard to tell really whether it is in the mural and it's apparent spill over the wall and trunk is an illusion. Either way it is distracting once noticed : /
May I ? ...
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(above, one quick solution)
I copy'n'pasted an upper part of treetrunk down and, once in place, cut the bottom off so that it was level with the wall, then darkened it slightly at the bottom edge (a bit too much so you could see it) just to set it back from the wall a little. I left this layer above all the others whilst I used the smudge/clone tools to fix the blueish cast...
Used smudge and a 1px-feathered selection mask to pull the greens over the ugly blues and under that new tree-base layer. First the left side rightwards, then the right side leftwards.
Then I cut'n'pasted a darker brick to replace the one that was there in the top row, slid it into place and trimmed it to size.
Total time, less than 2 minutes, but you could be more careful : )
Unfortunately there isn't really a tool for removing lens flare (if that's what it was) so you just have to tidy up, even rebuild sections, using whatever tools are appropriate for the image behind, such as using perspective clone tools for replacing brick or tile, etc. But with enough patience even large problems can be fixed.
My first go with photoshop, (well LR and photoshop elements - but I have CS2) - the problem is I have no idea what I did, (apart from the history) or why I really did it - just changed things on the fly until I got what I wanted - must read the book or something? - trying to make it look different - "not real"