think you should give a work of art, because teachers are more tasteful. But in fact, you can give anything as long as you prepare it carefully.
First of all, I think it is more practical, because teachers usually work standing up and are very tired. You can buy a massage pad for him. Express your concern for the teacher in details and think about the teacher from the perspective of health. I believe the teacher will be touched.
Secondly, I recommend a personalized gift here---a real doll. Also known as a cartoon pottery doll, it is a real-life cartoon sculpture handmade based on real photos. It has the characteristics of Q-version lifelike, creative and funny, no deterioration and no fading, and can be permanently commemorated. According to the teacher's photo, a unique real doll is tailored for the teacher. The teacher likes it and it is also very commemorative.
Finally, you can also choose to give a digital painting, just like the principle of cross stitch, you can draw a painting by yourself and give it to your dear teacher. When the teacher hangs it on the wall, he will think of you as a thoughtful student. I believe the teacher will like it and feel gratified for the educational work he has been engaged in for many years.
That's about it. You still have to choose a gift according to your specific situation. I hope the above suggestions will inspire you.