A simple and very efficient method to increase the visibility for small CDC dry flies tied on #16-22 : adding a small bunch of white CDC barbs in front of the wing.
In certain cases I use yellow or pink instead of white, especially at sunset when the light and the shadows become metallic.

Here is the step by step:

Materials for this fly:

Hook: Maruto Dohitomi D04 BL #16

Thread: 70Denier Olive

Body: Devaux yellow thread for bodies

Tail: coq de leon indio claro

Torax: mad rabbit dubbing

Wing: CDC Khaki Campbell feathers

Hi-Vis: white CDC barbs tied in front of the wing