The photos of swings are completely free to be used for any legal purpose [for personal and commercial use]. 
All without asking for permission, but always you must add link to the source and descritpion:
"Iwona Kosicka Design  www.circleswing.com"


http://circleswing.com/uploads/zdjecia_nad_stopka/PRESS1.jpg
http://circleswing.com/uploads/zdjecia_nad_stopka/PRESS2.jpg
http://circleswing.com/uploads/zdjecia_nad_stopka/PRESS3.jpg
http://circleswing.com/uploads/zdjecia_nad_stopka/PRESS4.jpg