Hi Paul,
First off, no I don't think you have a long way to go, I fully agree with Stik in that I think you have a good eye for composition and subject. Whilst photography is one of those things were I'd argue that you never stop learning, if your goal is to move away from just 'snap-shot' photography and become a competent photographer then I'd say you'll easily reach that.
Secondly, thanks for sharing your reasons why. As I said, I'm rather nosey, especially when it comes to the enjoyment of a passion that I've had for nearly 30 years, and I love to see other people enjoying it. I'm really glad that it's helping with your health - it doesn't surprise me, creative things tend to do that - your wife was obviously right
Comments...
Well to be honest only one actually - which you probably already know. There's a couple of shots that I think are very good, but could do with just a little bit of a tighten up on the subject matter.
I love this image, I think the sunset is excellent, but if the subject is the tree and the sunset, then you do have a fair bit of wasted space around the edges of the frame.

I'd just suggest thinking about what the subject of the shot is, and concentrating on that. I'm not suggesting never use wide angles, as 99.9% of my photos are taken between 18mm to 50mm, but just pulling in tighter around the subject.

Now.. This is just my opinion, and I don't consider myself a particularity good photographer, and you may well not agree with me - and that's just fine. One of the wonderful things about photography is that it is entirely subjective!
My favourites are these three - I love the composition on all of them - you obviously know your thirds!



Really good work Paul, please do share more as your course progresses as it'd be great to see how you get on. By all means take a look at my blog (the link is below) if you want to see of my efforts.
Cheers!
Stuart