I ping to clarify my statement before moving on to a suggestion,by NO MEAN AT ALL,does this beautiful paintjob need any of what I'm going to suggest.it's just an idea and a sliver of how I think and thought process when I paint.if this were me Ide add patches of a bluegreen,hawk turquoise maybe, and then highlight very subtley,that b,jegreen.reason being Ide be using it as a spot color.and Ide use the spot color as a bluegreen (getting some blue in there),because main dominant color the trees trunk of brown is closest to yellow on the color wheel.now the reason Ide add these blue green patches in random spots is because blue is the compliment.now why do we use a compliment to a color instead of any random color.well,the reason is simple when you put a compliment next to that compliments color what happens is your introducing to the eye of the viewer all three primary colors (blue ,red,yellow) .just like why a rainbow is aesthetically pleasing to the eye because it contains all color of the spectrum as an eg.it's the same effect here the reason we use compliments of colors is because all 3 primaries are in that combination of color and compliment...just plain makes it more aesthetically pleasing to the eye.but again you did a technically wonderful job and I absolutely love them,my advice is not necessary it's just an idea of what Ide do and why.gr8 work moetle.