They are different but not so much so that it’s hard to communicate. I learned south welsh because that’s what was taught at my university. It differs in little ways sorta like British and American English. I actually wish I had tried learning north welsh since that’s where my family comes from originally. But knowing south welsh, I can still communicate just fine on the streets of north wales. It just depends on your preference. :) a lot more people have a northern dialect though. :)
Sketch. Sketch a whole lot. Fill up sketch books. Also, sometimes communities have really inexpensive/good art classes you could sign up for. Or if you’re in University or High School, I’d say take the beginning art classes.
But until then, sketch a lot. Do studies of things you see, and don’t worry if they look bad.