Many women looking for a new look head for the hairdressers - after all the quickest way for a change of image is to change your hairstyle.

But without a little thought the results of a dramatic change can be disastrous.

They say it's only hair and it grows back, but try telling that to someone who has just had their hair cut and found that their long-awaited new style not only looks terrible on them, but bears no resemblance to the way it looks on the model or celebrity in a glossy magazine.

The chances are that they made an all too common mistake and failed to take into consideration their individual face shape and hair texture.

Admittedly, finding the ideal style for you can often be confusing and even celebrities surrounded by stylists and image gurus can get it wrong.

So, before you walk into your favourite salon and demand a Davina McCall, first remember to consider the four main facial shapes; oval, heart, square and round.

If you're not absolutely sure about your own face shape, try using this quick and simple method, Take an old lip liner or eye pencil and sit in front of a mirror. With the pencil, draw around the reflection of your face and when you step away, you'll see which face shape you fit into.

Once an individual face shape has been properly defined, there are some perfect styles for each one that will help put an end to those so-called 'bad hair days.'

"Square faces, like Sandra Bullock's, will look fantastic with shattered layers and textures to help soften hard edges on the face, while those of us with heart shaped faces, including Cameron Diaz, will always suit a classic bob and lots of layers around the face. For those lucky enough to have an oval face, like Cat Deeley, pretty much anything goes but especially flattering for slightly longer faces are off centre partings with a flick to one side," he adds.

Now, in addition to the perfect cut for each of the four face shapes, there are also definite style no-no's that Douglas thinks must be avoided at all costs, "For a square face don't have dead straight, one length, or asymmetrical hair - Jennifer Aniston counteracts her square jaw with layers at the front."