You may want to add another tablespoon of curry powder and even some red chile flakes according to how spicy you like it.
Add additional vegetables; carrots, bell peppers, potatoes, peas, or zucchini are all very good.
If you like your curry saucy, (as we do), save the drained tomato juice and add 1 tablespoon of cornstarch to it and stir till smooth. Add it to the curry sauce and stir until it thickens over medium heat. Then reduce heat before adding coconut milk.