At a glance, my first point would be, for any pads that will have larger wires soldered to them, staple them with a grid of via's to the other side inside the pad, it will make it much harder to tear the pads off (In my experience I have had boards snap before pads tore when I do this)
Your using Kicad, for future products, I would suggest setting the paper size bigger, spacing out things nicer and using net names so its easier to know what the function of each trace is as you route it, but thats just procedural recommendations. (your schematic is kinda hard to read due to how cluttered it is)
Your crystal wires look kinda long, and routed around other less important stuff, If you can try and group that up nice and tight so no digital logic crosses your crystal.
No external pullup on your reset pin in a high noise enviroment is kinda asking for trouble.
For your motor drivers, consider what happens when your microcontroller is in a reset state, e.g. programming, all pins become inputs with pullups, if this causes unwanted behaviour you may want to add pulldowns to pins that must stay low.
The other recommendation I would add is make clear what your input voltage range is right next to the supply wires, It will prevent dumb errors,