Thank you Pitchwife - that is interesting that it was used for that purpose ... certainly more intriguing than the classic author photograph.
I agree about Mirkwood... though there is some light it just serves to make the darkness..darker - and there is something a bit fey about it...and the way he seems almost to emerge from the roots.
On a side note, some people have been kind enough to tell me privately they like this but feel they have nothing to add. I had hoped that by putting it on N&N that it might encourage posting since I thought it was something that could be responded to by anyone who looked regardless of whether they were completely au fait with every detail of Tolkien's life and work. So I hope we might get a few more responses even if they are just an impression.