Hi!

Welcome to cel collecting, and to the forum!  

I can try to answer your questions about the 
sketches, although I'm no expert, I'm just going 
by the genga and douga I have (I collect 
Dragonball Z/GT).  It looks to me that the yellow 
and blue sketches are the genga.  The blue could 
be the correction sketch.  I only have the yellow 
and white, so someone with more experience can 
answer that better.  The white sketch looks to be 
the douga that the cel is made from.  The gengas 
aren't as common as the douga, but they are 
really cool.  It is confusing to tell them apart, 
though.  

I hope I've helped you a little bit.  I started 
collecting a few months ago, so I'm no expert, 
but I thought I'd try and help.

Again welcome to the forum!

If I'm wrong, I hope someone will correct me!  I 
don't like giving incorrect information.  :-)

SherryLynn