I don't know if I'd ever mentioned before how I like to stuff my little dolls. I'd taken pictures a while ago to help illustrate what I do, but I don't remember ever having gotten around to using them. I get questions from time to time about how to get even looking heads (specifically) and body pieces so I thought I'd show and tell how I do it.
First and foremost, crochet your stitches as absolutely tight and uniform as possible. This is very important so that there won't be gaping holes where you see the fiberfil/roving when you get it stuffed as full as you can.
The amount of fiberfil that is used is a very large amount in comparison to the size of the head. It usually ends up being double the amount that you think will suffice, and even then you might want to stuff it even fuller.
I've found that lumpiness and odd shapes are reduced when I use a great deal of small bits of fiberfil as opposed to using a big lump of it. You get a small tuft of the fiberfill and then pull at it, stretching it apart until it's barely held together, then at that point it's ready to be inserted. While inserting the fiberfil, take care to place it as evenly distributed as possible around the shape you're stuffing.
As I fill I make sure to stretch the fabric of whatever shape I'm stuffing from the inside, pulling and shaping from the outside and using a scraping motion on the inside with the back of my crochet hook or whatever other tool I'm using to help stuff.
Just keep stuffing, pretty much until the head becomes a little hard ball, and can't be stuffed anymore.
At the point that no more fiberfil will fit, finish crocheting the shape taking care that your stitches are still tight and uniform and seal the hole.
Remember all that fiberfil in the first image? Even though the head already looked full, all of the fiberfil shown with it was stuffed into the head. This makes for a very hardheaded little doll which makes them perfect representations of my stubborn little kids :)