Nicely done. You're looking pretty darned fit, these days.
Myself, doing a bare minimum of "exercise" physical activity, my caloric requirements are roughly ~1200-1300kcal/day.
So long as I can maintain a good 500kcal/day exercise (on average), I lose weight. I tend to drop ~10lbs/mo or so, if hitting ~1000kcal/day for weeks at a time (with the occasional rest day tossed in, as needed).
Funny how, when it comes down to it, it's basically a calories in / calories out problem. Create and maintain a deficit, have sufficient nutrients and hydration to keep it all working, then boost exercise enough as fitness improves to kick in solid weight loss and/or strength and size gains as desired. Hard work, but over the past 40yrs of athletics and general-purpose fitness experience, that blend seems to work for me.
About the only limiting factor for me, in the past handful of years, has been old injuries that have required much more determination to accommodate and sidestep.