Man, that looks professional!
Looks great. I also like the color contrast of the leathers used. Well done.
Very nicely made and thought through. As for the page marker, the only thing that could be done is stitch it right on top of the cover, everything else would make it stick out more and make for an uneven surface to write on.
A fine job indeed! Replacing the leather page marker with some satin ribbon might be an idea to make it less bulky but look decent.