Don't worry, new computer programs can. Better yet, they can erase them. You've invented something wonderful. You've even prepared rough sketches and the written part of the patent application yourself, saving thousands of dollars by not hiring a patent attorney or agent to do the work for you. You're no draftsman, much less an artist.
Many inventors turn the job of preparing drawings over to a professional draftsperson.
This can be costly. Because most patent applications have two or more sheets of drawings, you can easily shell out many hundreds of dollars per patent application. Fortunately, if you can do the patent application, you can probably do the patent drawings yourself, too. But there are many rewards. In addition to saving a ton of money on the application, you will be able to prepare promotional brochures for prospective manufacturers or customers.