Now a days, cover worth something unbelievable value to any product. It is a must to design them perfectly. If you write something great and your readers find them in a ordinary wrap, I mean to say in a cover, then ultimate result will be a big zero. Besides, if you choose a world class designer to create your book cover and because of his negligence (please do not take the term otherwise, they have no time to discuss about your content or subject) it does not go with your book, then your effort won't boom.
Well, as a die-hard Graphic Designer I am experienced about the fact that I mentioned above and I am offering my sincere service to make your cover eye-catching and relevant to the subject of your book.