A centuries-old oak

October theme for the Sketchbook Challenge is Tree. I took a close-up photo featuring a centuries-old oak in front of Prins Eugens Waldemarsudde in Stockholm. Then I used Photoshop, duplicated layes and used different filters. I find the pictures very effectful.

My cropped photo
 Using different filters:

When I intended to publish this an checked the Sketchbook Challenge-blog I found that Terry Grant had made something similar.