Welcome to steemit @honghkd :) I was a high school English and ESL teacher in Canada for many years, so I totally get what you're saying about math haha
Your art is beautiful! Here's a tip: for posts to be recognized as your own work, when you show photos of your art, include process photos too ... that way it "proves" that you did it :)
I found your post because @macoolette featured you in her Pay It Forward Curation contest entry; we'd love to have you join us with a post of your own next week ... it's a great way to start developing your own community here too :)
Thank you for your comment. If I draw another picture, I'll follow your tip. I don't know how to join it. But i will try!
Sounds awesome @honghkd :) If you click on the entry link above, it has all the rules for you. But no worries, we host it every week, so you can join anytime!