Yes. Zoomblr shows Seya9's public posts and profile picture with no Tumblr account or login required. It's completely free.

Open Seya9 on Zoomblr and tap the download button on the avatar to save the full 512px image in its original format (JPG, PNG, GIF, or WebP).

Each image in Seya9's feed has its own download button — tap it to save the picture in full resolution. Photosets give you a button per image.