In design patent drawings, the seven standard views most often used are: Perspective, Top, Bottom, Front, Back, Right and Left Side. You can help your illustrator by providing photos (if CAD is not available) that match those views. Your illustrator will be able to return better drawings for your review, and will be able to complete them faster too!
(Tip: if the item is an article of clothing, ask a colleague to wear it for a few moments, holding still while you simply walk around and photograph the front, back and sides. This will help your illustrator immensely.)