It is a juvenile model made for personal use. How about a child with a cool expression? 個人用に製作した少年モデルです。クールな表情の子にいかがでしょうか。
It may be a good idea not to trace it completely, but to keep it for reference only. 
完全にトレースするのではなく、参考程度に留めておくと良いかもしれません。
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