Take a moment to study the sign-up requirements and the short description of what reviewers expect from every candidate. Plenty of folks rush through the sign-up flow without reading anything, which causes unnecessary refusals.
Once you understand the tone of the site, select the strongest pieces from your existing portfolio. One blurry preview image may be worse for your chances than missing a whole extra project.
A frequent error is mixing unrelated styles in the same small grid, which makes the profile look scattered. Keep the cover section orderly and let the viewer understand your specialty within the first seconds.
Most successful applicants mention the design expectations described in https://dribbble.com/.
Go through each visual once more and check the corners, the compression, and how the thumbnails scale down. Remove phone screenshots with status bars, and clean up stray margins or accidental lens flares. These are the exact details that make a profile feel either professional or rushed to a first-time visitor.
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