Not being critical but thought I should pass on some advice. It appears you did the stitching with a single needle and thread. Result is thread appears to skip holes. The corners and straps would originally have been stitched with a harness or cobblers sewing machine employing needle and two sources of thread: spool and bobbin. To replicate this you would use a threading awl to push a loop of thread from top spool through hole in the top of leather, pass the other thread through the loop on back side, pull the awl back through, pull thread on top side taught, then push another loop through next hole, and repeat. That way you have a continuous line of thread from hole to hole. FYI for next project.
Edit: Looking at the photos again, it appears you used both single and double thread methods. Double where the straps for handle are sewn to the box and single thread skip-stitch for leather handle and corners.