Hey there, Beth! Nice one. You should not have problem selling as long as the quality is there. Your customers will know what to expect.
Sumi is basically particles of soot, so it tends to be more noticeably grainy in the lighter areas of washes. Most inks are that way actually, but different brands are finer than others. There is "student" grade sumi just as with paint. When working in washes, I tend to just go with a different medium if I want smooth, like watercolor. Did you use liquid sumi or an ink stick?
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