I have never been a very good painter. I aspire for my models to look good on the tabletop and just try for a clean paint job. I have tried highlighting but I always seem to do it wrong and dont like the results

..so I haven't given up.. but I'll try the technique on smaller less attention grabbing or army centered models.
IMO A warboss should be DARK. the codex describes the biggest ones as having almost black skin because they are so dark. Also I tried to scar and rough up the tips of his powerklaw for battle damage.
http://imgur.com/a/nvZ1R
Thanks all.