I feel my writing has much improved since I improved at art because I now think much more visually with my books; 'is a scene in a book easy to imagine?' 'Does it have an appealing composition?' makes for much more entertaining storytelling.
And my art has improved through my love of sewing, and dressmaking, and the history of fashion; the drapes of my fabric and the way they rest on people is more realistic and pleasurable to look at!
And my love off building things from wood has improved because of my love of dressmaking. When pieces of wood are cut up they resemble a dressmakers pattern, but in a solid 3D piece, that in turn, has helped me with my art