Thank-you very much Richard for taking the time and sharing your wisdom.
I completely accept your point about "similars". I should have paid better attention to the forum before I began, as I mistakenly thought that the greater the volume of images the better my chances. I shall adjust future uploads accordingly.
I'll also aim for more action - something I had not considered before. I've taken a quick scan of your own portfolio ... I'm envious of so many stunning wildlife images ... I can see what I'm up against! The action element in your pics really is apparent, I understand now how that adds greatly to the image and its appeal.
Very many thanks again,