Welcome to the site! I really like what I see of your work!
One bit of advice I would give is to always remember that the pot and tree have to complement one another. You never want a pot that is the primary focus of attention. One reason why most bonsai pots use earth tones is because that is what most bonsai trees use
Many earth tone pots can be used with many trees... while if you have a colorful glazed pot, its use is generally more specific - and may be purchased for only one specific tree in an enthusiast's collection; perhaps to complement its blooms, fruit, or fall color. I often will see people who first get into bonsai potting creating unusual designs and using brilliant glazes, but that's not where the market demand is. That doesn't mean that there isn't room for tons of creativity, but always keep the tree in the back of your mind. Simple shapes sell well... but if you want to be creative try to use organic shapes and natural textures. For example if you start thinking about making pots that look like stone, or the side of a cliff, or a pile of leaves, or a hollow piece of log, or a piece of bamboo... there is no limit to your creativity. Also crackle textures and finishes that mimic bark, lines that mirror the shadow of a branch, or drip glazes that look like water, things along those lines.
Also, keep in mind that it is not just the design and color of the pot that matters... it is the patina; the feeling of the pot being old and being used for a long time. To the extent that you can make your pot
look old (even if it is new) you will attract more buyers. (Make sure you are familiar with the Japanese art asthetic of wabi-sabi).
Because most potters start with wheel-thrown pots, there are a lot of round pots out there, when rectangular shapes (slab built pots) are the number one shape of pot. Something to keep in mind. Additionally, I think the market is over-supplied with small pots. I understand the risk and cost associated with larger pots, but I have very few trees that would be planted in a pot smaller than 8"... and I can't tell you how many pots I see offered that are
smaller than that, when my interest usually starts at 12" and goes up from there. A 12" pot would normally work for a 12 - 18" tree (as a general guideline depending on a lot of things). Just looking at all the trees on this site, how many are smaller than 12" tall? (not many)
My all-around favorite domestic potter is Sara Rayner. I have been following her work for over 25 years, and her pots are pretty universally excellent now - both showing plenty of creativity and individuality while working well for bonsai. She is a good example to look at because I think her portfolio is both uniquely American and yet embraces Japanese esthetic.
A new pot that looks old:
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A simple pot with organic glaze. Note that the glaze gives the impression of wearing thin on the edges and rim of the pot - as if it had been handled for years - even though the pot is new.
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Also for ideas look at high level exhibition bonsai, and the pots they are displayed in.
@Walter Pall is a member here, and some of his exhibition pots are incredible - particularly some of his Japanese maple pots.