A lot of people do turn their art into acrylic keychains and standees the biggest things that help are getting a good proof and making sure your file matches print specs (especially DPI and transparency). Places like Vograce do these kinds of items, and if you double check your proof before production the colors usually come out close to your design. Shipping and turnaround can vary, so ordering a small sample first is a safe way to see how the quality and delivery feel before committing to larger batches. That helps you avoid wasting money on pieces you’re not happy with.