The tut that helped me the most in realistic waves on here at renderosity in the bryce tuts by Zhann.  "The Summoning"  

Eyeballing your image appears that the bump may be negative.   Play with that slider Agent Smith pictured (there absolutely has to have the bead clicked one of the columns for it to work)  You will see it will add increasing amount of bump as you move it leftward but if you move it back to the "0" setting and keep sliding it the values will become negative.   I know I have lost you.   Do not put Bryce away...  It will happen and you will be elated. 

http://www.renderosity.com/mod/tutorial/index.php?tutorial_id=386