review of ceramic resonator layout for atmega ciruit
I'd call that a decent implementation, covered all the essentials. I haven't checked the footprint for the resonator tho.
Question: why did you choose a ceramic resonator, instead of a crystal, or for that matter the onboard RC oscillator?
And if I may probe further on the potential consequences of these options, will you be doing anything requiring high speed response/timing, like high speed serial or controlling WS2812/or equiv. RGB LEDs?