Nice and simple. I think it might have had better impact with black and white, even to the point of leaving the mower in color and the rest of the image as black and white.
I was going to do a shot like this, but then I realized that I had no tall grass to shoot because everything around here is dead from drought. I like the overall composition, but the colors are not as vivid as I think they could be. You might consider doing a selective desaturation on every tone but the reds to make that lawmower pop out against the rest of the composition.