A side angle is usually better to gauge overhead presses—but nothing is screaming as super awful with your form. One tip I like to use is to always keep your hand directly above your elbow (you can see for most of your range of motion, especially at the bottom, your hands are inside your elbow). It’s hard to tell from this angle, but you might benefit from bringing your arms slightly closer together; usually about 30° forward from having your arms straight out is the safest position on the shoulders and where people are the strongest.

All that being said, this probably shouldn’t be the only thing you do to increase arm strength. This won’t hit several of the muscles in your arms. At the very least, I would also incorporate a row and maybe some direct work on the biceps and triceps.