The XP bonus for putting the icy roses is not shown on the maps of the mine.
It is described at the end of Slanka.pixel's detailed walkthrough, but I know not everyone uses those.
gamemaster The player got the bonus, just reported that it's not shown on the maps.
@Roeland Please update the maps.
Abhi yes I overlooked that one and have added it a few hours ago. Thanks for the warning