Creativity is a must. The book cover could be text only or can include an image. If it looks like a text book or uses images that are too high-tech (i.e., a scientist looking at a beaker), it will probably not be acceptable. Since vitamin D is generated from sunlight exposure, this concept may be successfully incorporated into the design. The word Impact in the title, could be a manipulated to appear "shattered" or some other form of visual effect.
Stock images are acceptable.
The file of the winning design should be in Photoshop format, with all layers easily editable.
Contest submissions are most effective if also rendered to show what the design would look like in book form (optional).
The author has recently conducted a successful design contest through 99Designs . If the designer wishes, he or she could review this contest to get a sense of what does and does not appeal to the contest holder. This contest was entitled:
Create a baby health/wellness book cover about vitamin D
ATTENTION DESIGNERS: I am receiving too many entries that would be more appropriate for a book on the benefits of vitamin D. My book is on the negative impact of vitamin D deficiency. I need a little (actually, a lot of) drama in the book cover in order to capture the customers attention. A dynamic text effect my be the ticket. As a suggestion, why not place the book title in a big block of 3-D text, blocking the sun AND casting a shadow over a parched landscape. (Just an idea.) Plain fonts, nice images of vitamin D, an attractive person basking in the sunshine, or a sunflower does not seem to garner more than one star in the competition. Such designs are nice but not what I am looking for.