what is the most important skill in creative branding?

Good copy (writing skills) along with original, creative graphics.

A professional LOGO for all of your documents such as your websites and all other portals.
Totally focusd on the products.
A good content along a professional product photography not only for website but for a separate product gallery as well.
A professionally created unique design to appeal the visitor.
Product describing advertisements or intro video.
Animated would be more cool.

Think out of the box---- unique and generic ideas .. helps you with creative branding and makes you standout 

ART :D

Delivering the BRAND IMAGE and BRAND MESSAGE by creating effective logo, Slogan, Color Selection and brand Packaging.

A thorough understanding of your brand.