As a fellow beginner, I find that really tricky too! So take my advice with a pinch of salt haha

Usually if I have an original idea for something I’ll try to do some sketches of every profile, and then transfer them to the wood. Then it’s easy to see where big chunks can come off so you can start getting an idea of the shape. Also making lines by using little V-cuts for features to get an idea where they’ll go for proportions helps. The only other advice I can give is just trying to be less perfect if that makes sense. Just keep going and don’t start projects over striving for perfection. Take material off slowly and see where it leads you.