I didn't vote in this challenge, but would have given this very high marks. Why? You took a risk with the 4th tree that really works. Instead of making the photo appear too square, it adds tremendous interest. Also, great lighting and focus.
Nice shot - and by the way, I disagree with a few of the more accomplished than me folks who commented - what makes this shot appealing to me is the fourth tree. Yes, threes are more balanced (rule of odds, not just threes) but I like this poor little "I think I can" tree at the end.
Very, very nice. I like the saturation too.
I'd have the 4th tree cropped out (it doesn't "match" the others and "weakens the image). Staying just with "3 in a row" defenitely gives a higher impact to the whole image.