Disclaimer: So sorry I called the piece “bubble letters” when it wasn’t. Some of you might think i’m a toy but I’m not saying i’m a pro. I just found making my own alphabet helped.

I’m not the best, but here’s a tutorial on how to make a graffiti tag.
The alphabet is at http://people.uleth.ca/~headsofhiphop/graffitialphabet.pdf
The paper/printout version of this video is:
http://uleth.ca/~headsofhiphop/graffititips.pdf