UPDATE (PLEASE READ)
I've attached 4 self drawn illustrations, yes I know they are bad that's why you are here - hah! This should give you an idea of what I am looking for, please make them look more professional than what I have drawn here.
I've attached a few samples of illustration styles that are similar to what I am looking for. Please use these for guidance, but they are not perfect.
Remember all 3 images need to be represented in the illustration. If you omit the text, the image should be about half of an 8.5 - 11 page. If you include the text it would be 3/4 of an 8.5 - 11 page. It can be smaller than this, but not larger.
Colors: I am somewhat indifferent to the color choices used, I would prefer a white background most likely because this image is going to be incorporated into a brochure. I would say some combination of the primary colors would be good, less is more I think since there are a few illustrations.