Define your style: You can inspire yourself in other people's style and follow their example, this doesn't mean being a copycat! It's not what you want, but inspiring yourself in your favorite bloggers it's a great help for you and to get started with your blog. So don't copy others style, be yourself, find your own style and make it unique and the success will come naturally! There's many styles you can chose from 50 years to Gothic, or even the new fashion ones.
Be Positive: As a fashion Blogger you need to be positive and your fans will search for you in a way of inspiring themselves, just because your blog is about "Fashion" doesn't mean you have only to write fashion posts, its your blog, so use it as you want and that will make it even more interesting!
Believe in yourself and define a target! If you want to know more and want my help feel free to contact me :) I will help you in everything you need, you will have all my support!