This game looks great and I also really like having to look at the painting to solve those riddles. Personally I thought this game is a bit too long, which can be a problem for horror games. At some point I got over the sweet spot of the darkness effect being scary and felt more annoyed, as looking for clues for the riddles became harder. Maybe cutting two rooms would have helped, but I honestly wouldn't know which one I would cut, as there is a nice build up to them, which might be easily lost. But still, this is a great entry!
Ah, as a side note, for me as a non-native english speaker the last one was a bit harder, as I knew the solution but I had to look up the word for it.