To make something memorable, it is necessary to apply some traditional effect for your image. Not many designers would like to create such effect, so there are not many tutorials available on the internet. Here is a good one for your reference using the first spaceman as a topic.
日本語: まだ 日本語 版の翻訳はありません。英語で見る — showing the original English article below.
Make a Retro Space Themed Poster in Photoshop
日本語
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