Nice shot mate. HDR can be tricky, especially with a lot of plant life around. It takes time to find the right settings sometimes. I usually crank down the saturation a bit to prevent the 'overcooked' look you can get in HDR, and in an overly 'green' setting like this you want to lower the saturation of the yellow color slider in lightroom. I know it sounds counter intuitive, but there is a lot of yellow in leaves and grass when doing an hdr. give it a try :)