Awwwwww really thank you so much, I didn't expect that my art would be considered your inspiration and that made me feel very surprised, like I've never been like that!!!
As for drawing Naruto's body, I think you can learn it online, on Pinterest because there are a lot of resources and knowledge related to the human body, in general a lot. Or more simply, you can learn by first looking at a human figure and then drawing according to the model's shape. If you draw a lot, you will be able to do it yourself because the most important thing is your perseverance.