Digital BW, The Print

Hi
I'm new to digital b/w printing, having just bought a C84 with the 
MIS UT EZ ink set for it.  I've been monitoring this group now for 
about 6 months, and I've been soaking up as much information as 
possible.  I'm trying to improve my technique, and have been having 
problems getting a good tonal & contrast range in my b/w prints. 

I was curious, are there any good reference images (tif or psd) that 
I could download and use to practice printing?  I took a look at file 
section for this yahoo group, but didn't see anything.  Does anyone 
have any recommendations for a reference image?