Of course it is ok with me.
I'm always glad when people like my fotos, so it's me who has to thank you for choosing it for your blog.
By the way, your blog is very interesting. I read the article about Heligoland. It's hard to believe they really intended to completely destroy this unique piece of land.
I have used it in my travelogue http://armchairtravelogue.blogspot.com and have given due credit to you.
Hope it is OK with you.
The travelogue is a non-profit ads free blog which I have created as a pastime and I do not derive any monetary benefit from it.