how to upgrade image of strawhats?

Hello! If you mean mugiwara's team and yonko outfits (ссылка) then to upgrade mugiwara's team outfits you need to synthesize it with two Thousand Sunny (Таузенд Санни) as catalysts.
To upgrade yonko outfits you need to synthesize it with:
outfit levels 0-27 - two Great Strengh (Великая сила) as catalysts
outfit levels 28-45 - two Four Emperors (Четыре Императора) as catalysts