As you can see, I kinda messed up the highlights and texture, but I learned a lot!
I think your problem might be that you’re trying to just copy your reference instead of understanding it. I used to just begin drawing on the top right side and draw the entire outline of a picture without breaking anything down. This led to wonky, uncertain pictures that never quite matched up with the reference.
I think that learning how to break down references might be helpful, here’s an example I did for a recent picture:
"Stories are light. Light is precious in a world so dark." The Tale of Despereaux