step 1 of 4
I copied and pasted a nub from the mushroom and smudged and flipped and smudged some more--dodge and burn
step 2 of 4
I added a background with flood fill and paintbrush
step 3 of 4
I copied the green part from the source and made a stem - dodge and burn
step 4 of 4
I masked the mushroom and copied it twice--added shadows to flower, lowered opacity of layers and added snow with paintbrush