Pilou you achieved the "target": REFRESH :) :) it's hot here,now !!

Using an unbiased engine,results are similar(more or less) to real photos
This is a compositing
background sea is a real photo(original had a boat that i deleted)
inserted Scarab using Photomatch plug-in (C4D)
water splashes are real,just add a few in PS to cover engines and back line-hull
Girls are Jessy from Poser,inserted in C4D using Interposer-Pro plug-in
Happy Summer ! :)