Take the iron square piece off for now. Slide the mirror over to the left, so that it sits a few inches in from the edge of the mantel. Now hang the iron piece on the right side, above the boxes (and pull them in to the left a bit so they don't hang off the end of the mantel). Hang the iron piece so that it gives some height, but is still a couple of inches below the top line of the mirror.

Take the two glass candle holders and put the same color candle in both (preferable something like the red, to bring some color besides browns up there. Place them in the center area, grouped with the diffuser. Get some red dried flowers or sticks of some kind to add to the diffuser to help link them with the candle color. (I did that in the fall by adding some dried wheat stalks, which also absorbed the diffuser oil).

Try placing the tall metal bottle on the left end, in just a bit from the edge of the mirror so it overlaps, and if the top is open, add a few of the ecucalyptus stems that I see down below. The metallic gold bottle doesn't seem to fit in, but if you really still want it up there, place it tucked to the right and a bit forward of the tall metal bottle.

I would lose the insignificant things -- the little stuff. The diffuser, the candle and that little red (what is that?) round thing on the right.
You have the mirror -- raise it up and hang it (just for a start). Straighten everything out so it's not sitting at angle. Put the genie bottle thing on top of the boxes and move the taller orange thing to the left. I don't know what I'd do with the square frame thing on the left -- I think it can go.
All the things that you love don't have to be in one spot. You have good things. Make them stand out by not pushing them together with too many other things.
Just my opinion.

Les917,

I think I like where you are going with this. I am going to do some adjusting tommorow and see how it comes out. Thanks!

Annie1971,

Thanks for the advice. I don't really have anywhere else to put the diffuser being that I have a cat and I don't want to put it anywhere where it will be knocked over. I think I will try Les917's advice and tie it in with some dried flowers. As for the red ball ;) That is a crystal candle holder and the red ball is a candle. I start moving things around and report back with more pictures to see how it looks.

Thanks!

If your cat is like my cats, the dried flowers won't last long! :(