The trunk and branches have a very whimsical shape, and good taper. Quite agree the bark makes the tree look very aged. Do you ever clean the bark?

It looks a bit stained at the base, possibly from the fertilizer. It might protect the wood if you wash it gently with a toothbrush and water.

I do not know the science, but I think the wood is healthiest if it isn't constantly wet. Dirty wood can rot easier and receives less direct sunlight. Keeping the wood clean after the rain/cold season I believe allows the tree to regulate moisture in the air efficiently for optimal health. Any opinions on this?