In most cases, simplicity can be a bad thing, but in a select few, like this one, it can be the best thing to happen to a picture. If it were just a picture of the forest, it would not be all that good, but the way you implemented the bubbles is pure genius! Also, the placement of the bubbles is quite professional, because there is no obvious source of bubbles. It doesn't just look like someone was standing out of the frame with a bubble wand. All in all, it's a great picture, and I encourage you to do more.