I would think another candle and in bigger sizes. I'd avoid a lamp on the mantle. Beautiful wood on your wall.

Maybe 3 flameless candles/holders with timer?

With the busy-ness of the knotty pine and rock colors, I would do one large, simple piece of art.

There are a few different ways you could do things. You could look at adding a third, taller, candlestick on one end. You could even look at doing one large piece of artwork. You can see below we have included three different fireplace designs from our portfolio. Please take a moment to look through them and see if any of them might be for you.

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Looks terrific. Try spacing the candlesticks a little wider apart if you want.