That ogre look brill!
Okay, wavy hair or dreads? I\'d approach each quite differently as a rule. I\'ll presume you\'re using GS so for the wavy hair I\'d start with a blob of putty roughly cut to shape and block in the basic flow with some larger tools. Then it\'s just a matter of working on it with smaller tools until you get down to the smaller details, in a sort of refining process. I use pretty much the same technique for most hair actually, in any of the three putties I commonly use - Kneadatite, MagicSculp or Apoxie Sculpt.
For dreads I would choose to use Kneadatite because you need the stickiness and the waxy consistency. Mix the putty and put it aside for about an hour to partially set (or give it a good heating and come back to it in ten or fifteen minutes) then cut off little pieces from the blob and roll them on your palm or the table to the right thickness, flatten it a bit and give it a small twist; you\'ll want it a little longer than the finished dread as you lose a little during application. Pick up one end of the roll with the tip of a fine tool - I\'ll often use a large needle for this - and smoosh the end of the roll into the scalp, press out the edges to give a good join and then trim any excess. Rinse and repeat a dozen times and you should have a decent mass of dreadlocks

You may have to do this in more than one stage to fill the scalp area without disturbing the hair that\'s already in place - thinking about it I might choose to do alternate bits at each stage (leave gaps you\'ll fill with the second application if that makes sense).
Hope that helps, although I suspect it might be a little, \"Wah?\"

This is easier to show than describe (like most things!) but hair is one of those things you get a feel for by practicing.
Einion