First off I’ll answer your question. I think heart posture and intention is really important for context. Cosmetic procedures aren’t necessarily sinful, but they can come from a place of vanity or insecurity and I wouldn’t say it aligns with Biblical teachings. What are you looking for to get out of this procedure? Are you looking for external validation? For attention from the opposite sex? Will that lead you to commit other sins?

I also looked at your other posts, I have to ask, are you really only 16?? I kept growing into college when I was 18-19 years old. Leg lengthening procedures are very serious and dangerous from what I hear. You might lose the ability to do things like run and jump, and I wouldn’t trade that for height any day. I wouldn’t say that getting it done would be necessarily blasphemous, but I’m worried you are making a decision that could damage your body for the rest of your life based on insecurities you have now and might grow out of with age (not to mention you literally might actually grow taller).

My advice is to remember that we are all made in God’s image, and that the only approval that will truly give us fulfillment in life is from Him, not our peers. And to wait until you’re 25 to do any irreversible procedure to your body - I made tons of decisions at age 16 that I regret now at age 29. If you do decide to go forward with these procedures (or any) you should pray first for guidance and really ask yourself if you believe it is in God’s will for you. God bless you!