Cut, duplicate and mask carefully each part. Add layer stale of outer glow and inner glow with deep similar colour to 'petals' to add some roundness and soften the edges. Do the same for the stem.

Used hand drawn colour layers to achieve a bit psychedelic colours. Duplicate layers for wire flowers and feather-like leaves and overlap them slightly with a blend mode to achieve this look.

Use large brush with different colours and opaque settings to draw the background and then a bit of warp/twist and very strong motion blur.