Your knife making skills show a lot of potential.
Here are some of my suggestions.
Establish your profile lines and study their flow and form.
Take your time grinding your bevels. If you screw up occasionally like we all do and grind too deep etc., take the time to re-establish a pleasing profile and redo your bevels.
Determine whether you want plunge lines or not so you don’t end up with something in between.
If you intend to have plunge lines, I suggest using carbide guides to establish them. They really make the task easier.
Work your way down from course belts to fine. I suggest down to at least 320 prior to hand sanding.
Nick Wheeler has some great examples on Youtube.
Until your knife is as perfect as you want, dont move forward to the next step.
Keep a keen eye out for the symetry of the handle.
Once your handle is on, it is very difficult to improve the finish of your knife.
There should be no deep scratches and your finish should be consistant across the blade.
Good luck and have fun!