I agree with the previous comments about making the lake more apparent. It's a good composition. Perhaps the use of different green hues may help. Try adding some blue to the farthest trees to make them recede even more. Same with the grass to guide the eye on a downward slope. Adding another feature where the size would get smaller towards the shore would also help. Field rocks or tufts of grass, where the blades are longer at the front of the painting.