I see some green leaves but few. There may a little bit of all problems in the story. Transplant shock, sunlight, moisture etc. Plants require water more often in containers so try to keep the soil as evenly moist as possible. An automatic drip irrigation system works well if this is an issue for you. Japonicas have leaves that cannot tolerate the strong afternoon sun and must be kept in the shade starting around 11am or so. There will be new leaves but you will have to wait until the plant "produces" them. The ones that are dried out completely could be deadheaded. Place the pot where the plant will not get dried out by winds and where it gets only morning sun.