I've gotten at least one of each of those types 
of drawings before. The problem is that different 
studios use different things. I am sure that the 
top left is a time sheet, because the one that I 
have has notes in the margins for movement and 
placement and it says "Time" at the top. If the 
second and third drawings have the cel number in 
the upper right, then my gut tells me douga. I 
have actually had dougas from Sunrise with only a 
shoulder one the page. I am sure the yellow ones 
are gengas. I know I've only been at this for 
over a year, but this is what I've seen. As 
always, I could be wrong.