I am a freelancer and client; I have no graphic arts skills The job description is a turnoff for a professional. "I am looking for the lowest rates" tells me the work isn't important to you and that quality will be an afterthought. As a professional, regardless of domain, I won't cheapen my brand with this kind of work. You give detailed instructions on how to do the work, which is another turnoff for a creative professional. Tell me your desired end state, not how to get there.
Freelancers don't "deserve" to be paid any particular amount, and you have to determine the work's value to you. That said, experienced professionals won't ever see this job. I filter job posts by Expert, minimum $251 budget, and a few other things. Your post is perfectly designed to hire someone who is desperate, exactly the kind of freelancer you don't want.
You've had similar job posts. If you have an ongoing need for a graphic artist, you'll be best served by an ongoing relationship. I have a graphic artist whom I message with my requirements, she fills them and bills me. Simple. I sent a business book manuscript to my non-fiction editor, he'll bill me, we never discussed price. Over twenty years I've established ongoing relationships with more than a dozen freelancers, and it works out well.
You want an image of a mascot. "Need tennis mascot. My thinking is a combination of parts of the three attached images (indicate what parts). Please indicate price for basic vector image, price for full-color image, and price for an animated gif. Budget is a major consideration." Invitation only, spend an hour or two going over portfolios, invite eight to ten. You might pay $75 to get a great artist in an ongoing relationship.
What a fine and considerate response. This is purely a whimsical, silly embellishment (clearly) that is certainly not that "important" to me. If I get a lackluster product for $15, then I can absorb that cost and carry on. I love the creative process, personally, but without the graphic design skills I'm obviously resigned to this site and any entry-level freelancers willing to try my idea. I guess in a sense, I'm slowly trying to find that relationship you speak of (once or twice a year). My project verbiage was pretty poor and hasty this time around, so I apprectiate the advice there!