When you make your own images, remember after you finish, and before your ender, try wild new camera settings. This image improved greatly after widening the field of view. (I stopped short of tilting to the side.)
Bryce 5 handles complex models like this grass slower than Bryce 4, but the addition of the 'depth of field' more than makes up for it. This is one of my more popular images. The grass in the foreground was even used on a Canadian postage stamp.