There are freelance designers who have a listing on Microlancer Services (similar to Fiverr), or you as a "client" can submit a task listing where you are offering to pay a certain amount for a "tasker" (worker / freelancer) to do certain work. So you could then list the task for someone to create a design (or prepare designs for you to consider, .. or whatever you want them to do), and then taskers will place their offers to do the task for you. You can ask them to include in their offer their portfolio, so you can see what designs they have done ... before accepting their offer.

Should you find an offer from a tasker that suits you, you can then accept the offer. Your sats are put into escrow until the tasker completes the work per the agreement. If there is a dispute and the two of you cannot resolve it, either of you can file a dispute and then an arbitrar will help determine the resolution.

Microlancer is really quite an underutilized platform, which confounds me. There is so much talent around the world willing to take on a project like what you are asking, and so few "clients" are taking advantage of this very valuable resource.

You can create a job here on SN for Figma designers to get prototype and test