Well...until i joined my new firm i didn't know who exactly can become an expert in E-learning (or rather in E-teaching). While language competency is definitely the most required skill, that is not the whole story. With an extremely good vocabulary and descent grammar skills you will end up becoming just another technical writer or a content writer.
Before being able to visualize, it is essential to know the possibilities you have in E-learning. This possibilities depends to an extend on the platform you use for E-learning. Software like Articulate gives you immense options and a classy look and feel for your E-learning website. Expertise in Adobe flash can let you make animations and illustrations that is customized with your content. Adobe Photoshop and Illustrator lets you manage your images the way you want them to appear. Talking of software, MS-Office package is an often underestimated option for making interesting illustrations and designs. The possibilities in MS-PowerPoint and Word are not to be under estimated. One has to thoroughly spend time and research on the various tools available to actually understand its importance.