You look great with the current cut, Una. But I get the feeling of being bored.
Still, the pixie does take a commitment -- when you get bored it takes a long time to grow out. So if it doesn't feel "you," that can be a problem.
I think LOTS of face shapes and hair textures can wear a short cut. It all depends on the cut, as Echo and a few others said.
As I've said before, my hair actually behaves its best at a super short length - wash and wear, with no fuss except frequent cuts (which I must admit I don't always manage often enough -- I should go every five weeks but usually wait longer. And then it starts to look like a no-style.
I don't have the "perfect" face for a pixie. My face is angular and on the long side, not a perfect oval. My head is large in proportion to my body. My ears are big and not very pretty. (My high school best friend earnestly told me to cover them up because they were so unsightly.) According to that test that Imogen posted, I definitely should not wear a pixie, as my jaw is far longer than the measurement she proposes, and that is supposed to make me look "masculine." My nose is not large but it is not fine and pretty, either.
I DO have eyes on the large side and cheekbones. And as my stylist says, my hair "likes" to be this length. Most of all, because I have been wearing it for almost all my life, short hair feels like "me" and so I'm easy and confident, wearing a short cut.