Hello..I just saw your question on my Owl picture...I use Faber castell polychromos pencils,which as I type this are inmy studio,the yellowish combination of the pale lemon colours and some cadmium yellow on top...make sure you experiment first before committing them to the eye...good luck without Owl!!im deactivating this dA account soo but you can find myworkon Facebook ..Alan Woollett Art..:0)