Add a layer mask on the top frog layer and erase the dark parts where the light will fall. Add some sparkling dots on the skin to make it more shiny. See original frog picture for reference. The light froglayer below will now shine through.
Add the hat. I have cloned the white stripe on the hat (it was in the middle) so it matches the lightsource. The butterfly is color corrected and also light corrected with the legs painted and embossed. Don't forget to add shadows under the hat.