Paint the wing in a separate window, starting with a black wing shape drawn with the Brush tool set to 100 per cent Opacity/100 per cent Flow and then draw the feathers in with the brush tool in white. When finished, Copy > Paste into the character art document and merge into the character art layer with Layer > Merge Layers.
Cut out the character art with the Lasso tool and Copy > Paste it into the original document onto a separate layer. Select the bottom of the art and Copy > Paste it onto a new layer, using Filter > Pixelate > Mosaic to break it into squares. Set the layer to Multiply so it sits on top of the original character art. On a new layer add further squares using the Rectangle tool and spread out to create the dissolving effect.
Finally, add the floral flair to the bottom of the character art on a separate layer. Paint it freehand with the Brush tool set to 100 per cent Opacity/100 per cent Flow and use the Circle Selection tool to get crisp edges on the curves. Use the Circle Selection tool like masking tape: make the selection in a curve and use the brush tool to create a neat curved line inside the selection.