wow thank you all for your excellent advice!!! I really appreciate it 
@Gary-Wilkinson thanks for the advice on the text, and the toucan- he does stand out a bit more than necessary- I will move him in the next iteration.
@holleywilliamson - oooh I'll try that as well, with the shadows! Thanks it sounds like a great idea.
@TessW thanks so much for your detailed reply and also the illustration refs!!! I think I'm definitely going to rejig the text to be up the top now. I'll redo the front animals/people so they are also not so cut off as in my rough example. I was trying to go for a scene where you could spend time looking through the details rather than one clear focal point- though if there is one, the focus should be on the elephant with the main characters sitting on the elephant. Hopefully it'll make sense in the context of the story (which I can share more of once its been out- its for a self publisher
).
When you say resting spots, do you mean clear focal points or rather, areas of 'breathing' space- with not much detail (ie taking away the detail and saturation from the rooves would make it less cluttered and busy on your eyes, so your eyes can rest there?)?
Thanks so much for your encouraging words 
@tombarrettillo thanks for the advice about the rooves- that overall huge orange area was what was bugging me a bit too. I will check the perspective things you mention too. I think the rooves are probably attracting the eye way too much, as @Gary-Wilkinson says with the detail as well. I'm going to do some tests on how I can fix that!
@julian-beresford thanks for your kind words! I really appreciate your suggestions. I think that reducing the saturation+detail in other parts of the image will hopefully attraact the eye to the main characters (the characters on the elephant). Hopefully its also a bit clearer in the context of the book (I haven't done any other final illos but can post some others as I go!)- this scene was supposed to be when the main characters meet up with all the animals and they are all celebrating- less about the main characters and more about the overall 'party/parade' atmosphere- but I agree it probably needs an initial focal point of the elephant/characters. Thanks for your suggestion about the colour too- it something I know I struggle with especially on huge environment spreads like this with lots going on!! Hopefully repainting it with all these tips in mind will give a better result 
Thanks everyone!!! I'm going to rejig the sketch and will post it once its done before I start the repaint!!