Well done ! In today’s world, watercolour is one of the safest painting mediums, making the smallest impact on the natural environment.
Unlike oil paint, no toxic solvents are used. Unlike acrylic paint, no polymers (plastics) are used. The only binder used in watercolours is gum arabic.
One tip: Use a rag instead of paper to clean the brushes before washing them, so you will also waste less water.