first, stop using slideshare it sucks, make a dedicated pdf to show employers
two, use one simple typeface and stick with it.
three, reduce the workding and increase the images, show dont tell
four, but a book on grids find one and use it ( the layout book)
Five, show more of your thinking process ( initial sketches, brainstorming, inspiration, prototypes etc) Show people you are a smart thinking human being behind the images
Good luck
ps you straighedge?