You can design a signature by yourself, for example, your English name, write made by..., and you can put your name on it every time you make a picture.

If What you want to leave is not a signature, but a poem. The retro and tranquil ones you mentioned are very suitable for Byrds, or Shelley's poems, but most of them are very long and may not be suitable

Just leave a message, a famous saying will do.

Everyday and in every way I'm getting better. . .

If you shed tears when you miss the sun, you also miss the stars.

If you shed tears when you miss the sun, you also miss the stars.

If you shed tears when you miss the sun, you also miss the stars.

angelical, angelic

The furthest distance in the world

These are similar, you can also find some very peaceful words, you can also It would be a good idea to translate a sentence into English

I hope you will like it