I only made 2 so far, so I clearly need more practice for them to look good, but the second try was already better (which is a good thing since I made it for a friend). The teal one was my first try, and is now my new art journal. I used a double thread for the binding and I think that with the thread i was using it was a mistake because it makes the stitching a little bit big. For the pink one I used a single thread to bind and I think it looks prettier.
And here's how I inaugurated my new journal: