Ask HN: Help Finding/Deciding on A Graphics Designer

Hi Hacker News, so lately I have been working on this idea. Now I can code or at least I can learn to code and have been doing so for the past month. Problem is I cannot design but I am learning from hackdesign unfortunately I have no cash to shell out for a mac. So I can't really do stuff with what I have learned yet. Which leads me to the main point of this post. How do I find s graphics designer and how do I decide if that graphics designer is the right one? I am currently having a friend do some initial mockup sketches but he has talent just no drive. I have given him deadlines multiple times and he has failed to meet most of them. I am wary of cutting the cord with him but am unsure if I should continue working with him.