Here's a good spot to remind you how to do scale linings...
I follow the ref pic looking for light and dark areas in the scale linings. In some of the lightests areas of the scale lining that I can find, I actually put a little white down first. This way, if it gets too dark accidentally later, I can scrub my white pencil on it for a while and demolish some of the too much dark color, back down to the light again.
Then just go along with the ref pic, making some areas lighter and darker. There is usually a dark area under each scale, no matter how small it is. If you just used one solid color, you will miss getting your scales to look rumply. Even the spots have light and dark areas and you want to follow those too.
then I smash my scale linings down with white, then go back through it again to redarken the dark spots... I do this a couple of times. Once I get the scale color and shadowings in, I'll check the lining one more time making sure the light and dark areas show - cause it makes a HUGE difference as to how real your scales will look in the end.
Now Im gonna' play his song real loud to get myself in a good mood so I can do my best....
.... Tales that never fade....
http://www.youtube.com/watch?v=s4nWy8pmIM4
If I do this row of scales first, then go back up and fill in the missing part, I'll have a better chance of getting the pic to play right... to get the 'transition' right in that now missing area.