The website page that you saw the smaller version of the block on has instructions for a 13 inch unfinished/12.5 inch finished block at the end of the post. The lady did this design as a mini and a regular block. The bigger block instructions are for regular rotary cutting not paper piecing. Hope this helps.
Your block is good. Pretty, I like the colors. By the way, I love paper piecing and once you figure it out, you'll love it. As someone once told me. Just sew on the line and check twice before you cut.