I looked at some of your pics, and I think the low contrast in some of the image may be the issue. The eye is looking for contrast to focus on.OK, what I have learned from this thread is pretty much what I wanted to know. I'm not going to rush out and buy more expensive glass. Instead I will try and use what I already have better, and also accept that shooting in low light is not going to produce the very best quality images. Thanks again for all the input and roll on the end of this grey weather!
Low contrast is from both low light, close subject color (like black on brown), and shooting through fog.
The lack of contrast makes the image sometimes look "muddy," for lack of another word. And there is nothing to "pop" out to grab the viewers attention.
But sometimes, that is exactly what you want in the image.
If you enjoy that type of images, or are stuck with it due to weather, you might look for books and internet sites that deal with that specific type of shooting; to improve, and make it to your advantage.
Low contrast scenes are difficult for me also, so I take the easy way out and try to avoid them.