Beautiful colours. Very impressionistic. I think the border would be better in more of a pastel colour. The black seems to draw my eye to the edges of the image.
This has such an impressionistic feel that I feel I am looking at a painting rather than a PP photograph! I have tried my hand at impressionistic photo taking like yourself and it is sometimes amazing what a little carefully down camera movement can do. Well done here! Love the splay of colors here. The reds are bold and vibrant! And the colors from the tree stream off into the sky as the 'paintbrush' pushes the color up in long swift strokes.
I really like the super saturation here ... has a 'watercolor' feel to it, as if someone turned it up-side down and then sprayed water to blend the sky with the tree tops ... nice job
I really like what you did here with this technique. Sounds like fun and opportunity to use those shots that don't quite make it on their own accord. You should call this technique "Combineism" unless there is another name for it that I'm unaware of.