Add a Curves adjustment layer to brighten the left of the mushroom to fit the main light source. Paint on the right to keep its lightness.
Make a new layer, change the mode to Overlay 100% and fill with 50% gray. Use the Dodge and Burn Tool to change the light and shadow of the stem.
Add the mushroom 4 to our main document after cutting it out from the original image. Duplicate this layer and arrange the mushrooms besides the big mushroom on the right and in the space between the mushrooms 1 and 2. Use a layer mask on each of these mushroom layers to blend them with the existing ground.
Create a new layer below the small mushroom on the right and make shadow for it as done with the others.
Make a group for these mushrooms layers and add a Color Balance adjustment layer and alter the Midtones settings. On the layer mask, use a soft black brush with the opacity about 10-15% to reduce the effect on the stem of the mushrooms.
Add a Curves adjustment layer to darken the mushrooms. On this layer mask, use a soft black brush with the opacity about 30-40% to reduce the effect on the front of the mushroom as it's illuminated by the light.
Create a new layer below all of the mushroom layers. Use a soft brush with the color #1a1a03 with the opacity about 40% to paint a soft shadow for the mushrooms on the hidden side on the left.
Open the butterflies image and take different butterflies to add to the sky area. I've added a big one to the foreground and apply a Gaussian Blur of 6 px to it .
Apply a Gaussian Blur of 4 px to each of the small butterffy layers in the lower positions.
Create a Curves adjustment layer for the biggest butterfly to increase the haze on its lower body a bit. On this layer mask, paint on its top to reduce the effect there.
On each of the smaller butterflies on the sky, make a new Color Fill layer and pick the color #e4d7c2. Lower the opacity of these fill layers to 30% and 35% or any values you feel good.
Make a group for the butterfly layers and add a Curves adjustment layer to increase a dreamy effect for them. On the layer mask, use a soft black brush with the opacity about 30-50% to reduce the hazy effect on the one on the foreground and on the wings of the biggest butterfly or any details if needed.
Create a Gradient Map adjustment layer on top of the layers and pick the colors #480404 and #006020. Lower the opacity of this layer to 20%.
Make a Color Balance adjustment layer and change the Midtones and Highlights settings.
Add a Photo Filter adjustment layer and pick the color #f5c88d.
Create a Curves adjustment layer to increase the contrast of the whole scene.
Make a Vibrance adjustment layer to enhance the final effect: