Ok so here it is guys Im sorry my handwriting is so bad, hopefully you guys can read it, but if not, just ask me to clarify in the comments. You might have to zoom in to read it.
1. The main difference between drawing tsuna and primo is the eyes. Primo's eyes are narrower, while Tsuna's eyes are bigger. Primo also does not have the second circle inside the eyes *if you don't understand, ask me, I will explain*
2. One other difference is the middle strand of hair. Primo's middle strand extends, while tsuna's is shorter.
3. I've gathered that most people have difficulty with the hair. For the hair, be nice and sketchy. usually the pattern goes: One long strand, one short....but vary a tiny bit if you need too. Its the same for both tsuna and primo.
4. Tsuna also has that headphone thing if you wanna add that in too.
Another thing I would recommend is to READ, not WATCH REBORN, it'll teach you so much about inking, coloring and shading. DONT GET DISCOURAGED BY THE FIRST 100 CHAPTERS' ART OKAY. AT THE END ITS REALLY GOOD.
here is her artwork, colored. amazing. [link]
none of her characters or her manga or anything she owns is owned by me.
Hope the tutorial helped, and feel free to leave questions/comments below!!