How to save pictures from Tumblr?

Hello, I have trouble in saving picture from Tumblr App. I use pictures from Tumblr as my lock screen / homes creen.

I already tried saving the pictures by hold down the pictures. It works but the pictures turns out blurry eventhough the picture itself is in high quality.

To solve this, I usually tap down the picture to make it full screen and screenshot, but after Tumblr app re-update, the screenshot method didn't work since the full screen mode have icons shows up.

Is there any other than hold down method to save picture directly from the Tumblr app?

and I'm currently using Iphone 5s.