It seems very soft on the detail, so I looked at the file size. There may some excessive JPEG compression taking away some detail. (To be fair, however, all that black background compresses well.) Your file size is only 50k and you could have used up to 200k for this challenge. Compression kills detail. Always use the least compression you can get away with and still come in under challenge limits. Most image editors have that ability to adjust compression somewhere in the file save dialog. Here is how it works in Paintshop Pro, along with more explanation of compression, if is is of any help:
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