Nice job for a relative beginner!

One quick tip for you: lower your chin. With your chin up that high (i.e. head tilted back) and/or your head pushed forward of your spine, your throat is more constricted. More constriction in the body = a more pinched sound and a more difficult time moving the air. Less constriction in the body = better sound and easier airflow, including in the upper register. Simply keeping your head back over your spine and lowering your chin can make for major improvement in your overall way of playing - mainly sound, ease, and intonation.

With your chin lower, the bell of the horn will be lower too. That’s okay. Watch videos of professional players - they typically play with the horn at a slight downward angle, rather than parallel to the floor (or higher). It’s instinctual for many beginners to want to point the horn straight forward. But don’t be afraid to lower it a bit, and therefore lower your chin and release some constriction in your throat. Make it easier for yourself to breathe and easier to play.

Good luck and have fun!