I'm no expert, but looking at your portfolio, I'd say it isn't so much a question of pose as photography. You're quite attractive, even beautiful, but your images - at least the few I looked at - are rather small, making it difficult to really judge. Your portfolio contains some very lovely images - I find the first headshot especially lovely - but not too much is really gained by the closeups of your tattoos, etc., although I can understand why you might include them.
The best suggestion I can make is to get images better suited to display your features on the web. It isn't necessarily that the photographer(s) you've worked with is/are bad, but that the images aren't too well suited - too contrasty, or in some cases, too much diffusion/hazy/too little saturation or constrast.
Good luck to you.