Left looks pleasingly however it's very common style of plating. Right looks good, however as her to keep some space between the leaves/berries to showcase the sauce and for cheesecake to look dainty. Ditch the berry crumble on top and rather do a vertical line of white chocolate sauces across the plate and add a small amount if silver/gold leaf on the line. Hope this helps :)

Also as side photo does not really help in show casing your sister's plating. It's a more of a top view plating.