This looks much better already!
Your tall grass is really dark and heavily contrasted compared to everything else, though. I'd lower the contrast on that so it matches the rest of the set. I don't know if the shadows are mocked-up or not but you have some stray pixels in the shadows on the trees. The shadows on the flowers also seem too diffuse. Consider how close they are to the ground.
The "lightning bolt" coming out of the cloud is distracting, it kind of makes them look like thought balloons. It's not exactly bad, it's just kind of odd? The clouds also feel a little small compared to the rest of the scene, and I think they might benefit from another lighter shade. You have three colors in them right now but the two darker shades are close enough that it just looks like two colors.
The green mushrooms are also really distractingly bright - I'd tone down their saturation a little.
I'm picking over the details since you want it perfect, but your second mockup already looks so much better than the first. It's coming along very nicely.