Monstera Leaves Curling Sun. It will mature to the darker green shade as it ages. Give it plenty of water and let it drain out completely before putting it back in its pot.
Although they are hardy plants and can survive in a variety of growing conditions they prefer moist humid environments the best because of their origins in the rainforests of South America. If the leaves of your Monstera are curling your plant is most likely under-watered. Juvenile Monstera leaves will have no slits or holes looking more like a heart leaf philodendron but as the leaves mature they will gain more holes and splits.
In most areas it can take some direct sun on its leaves when grown in the house.
If we keep the plant out in the sun for too long it might cause the plant to burn. If Monstera is given too much sun the leaves will yellow. The leaf in photo 6 looks perfectly fine and normal to me. In most areas it can take some direct sun on its leaves when grown in the house.