emulating others people work for education is fine, even flattering so don't worry about that just note you are learning to make reality off a representation, (copy of a copy) So no one wants you to look at a texture and replicate it, not from an integrity stand point but as a model for learning. The paint overs/examples…
here is my take on your texture. every artist will have a bit a flare based on their observation, cant teach you to paint, but i can try to show you what you are missing and need to see harder here are some principals you can look at, you may or may not know them, (im writing this in your thread but anyone here can read)…