My layers vary with each haircut. I style my hair before I go in (every six weeks.) My stylist looks at how my hair is behaving at that time and cuts it accordingly. Sometimes my layers are more drastic then at others. I've gone to my stylist for almost 30 years and have yet to get a bad haircut.
I agree with rbb. Why don't you take some of the pictures from this thread to a stylist and have it done professionally?
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me