Please do not be worried to post here another examples. There are people who love to help. A few months ago I tried to find my first Bowie too so if I can - but I am not too good as Eric, Andy or Mark - I will help.
I know this example but if I remember well, there is even Best Offer opition so maybe it is possible to get it for better price. Ask Andy from https://davidbowieautograph.com/ he is good for David's 80'-90's signatures.
Post what you wish. You are not breaking any rules or being rude.
I'm simply pointing out some strange facts. You have posted many very bad forgeries in the past and said you are too old to learn.
Now you are posting very authentic signatures and saying that you now want to learn.