As an artist or designer, selling your work online can be a great way to reach a wider audience and to make a living from your craft. However, with so many online marketplaces to choose from, it can be difficult to know where to start. Here are a few steps that you can take when looking for an online marketplace to sell your art and designs, along with examples of artists who have been successful with this approach:

1. Research the different online marketplaces that are available. Some popular options for artists and designers include platforms like Etsy, Society6, Redbubble, and ArtPal. Take the time to research the different platforms and to read reviews from other artists to get a sense of what each one has to offer.
2. Identify the platforms that align with your style and niche. Look for marketplaces that specialize in the type of art or design that you create. For example, if you create digital art or illustrations, you may want to look at platforms like Creative Market, which specializes in digital assets like fonts, graphics, and templates. Or if you make handmade crafts, platforms like Handmade at Amazon or Fancy might be a better fit for your work.
3. Take a look at the work of other artists or designers who are currently using the platforms that you are considering. Browse their galleries or online shops to get a sense of the types of work that are currently doing well on each marketplace. If you find an artist whose work is similar to yours and who seems to be doing well on a particular platform, that might be a good option for you to consider.
4. Evaluate the fees and commission of the platforms, understand how they work and how much it will cost you. Some platforms charge a monthly or annual subscription fee, while others take a percentage of each sale as commission. Be sure to factor in these costs when comparing different marketplaces.
5. Once you have identified a few online marketplaces that align with your style and niche, and the terms and conditions are clear and manageable, it is time to set up an account and start listing your work. Be sure to make use of high-quality images and detailed descriptions to showcase your work and make it easy for potential buyers to find what they are looking for.

Some examples of artists and designers who have been successful using this approach:

• Lisa Congdon, an artist and illustrator who sells her work on platforms like Society6 and Etsy.
• Michael Megna, an artist who sells his paintings and prints on platforms like ArtPal and Saatchi Art.
• Lauren Hom, an artist and designer who sells her work on platforms like Society6 and Creative Market.
• Samantha Hahn, an illustrator and author that sells her books and prints on platforms like Society6 and ArtPal

Remember, as with any business, selling your art and designs online takes time and effort to build up. It's essential to be consistent with your listing and promoting your work. Creating a strong online presence through your own website and social media channels can also help to drive traffic to your listings on the online marketplaces. Additionally, networking with other artists and designers, both online and offline, can be a great way to learn more about the industry and to gain exposure for your work. Don't be afraid to experiment and test different platforms, and be open to learning and adjusting your approach as you gain more experience. With persistence, you can establish yourself as a successful artist or designer selling your creations online.