Once you're done merging, hold the CTRL key and click on the merged layer. Make a new layer again and choose the Color Gradient tool. You can use one of the standard colors there or make your own set of colors. Run the gradient in any direction you like.
Duplicate your Color layer and change the blend modes of both layers to Vivid light or Overlay . Whichever looks better.
You're done with one wing. Now for the other one. |