Lol no one can tell by a photo, really. I’ve posted pics of finished buds and was told I needed 2 weeks (when not even asking for advice).
That said 60 days is really quick, most cultivars range from 65-90 days, not that 60-65 is unheard of though. I used to grow a 55 day plant that just didn’t like going longer.
Best advice I have (only applies I f you took clones) is to chart what day you chop, dry, cure and smoke. Knowing how many days you took your plants allows you to tweak for longer / shorter flower time next run based on your expert visual, smoke and high experiences. I’ve charged flower times for ever 1st run plant I’ve grown for about 11 years now. Really takes any guess work out.