Oncidium flexuosum

These are my two Oncidium flexuosum. I have them both in the same pot. The flowers are now falling. I have had them for 2 months or so. I water them at least once a weak and I spray them with water once a week. I water it with orchid fertilizer every two weeks. I keep them at room temperature (which varies between 15^oC(59^oF) and 25^oC(77^oF)). They do not catch direct sunlight, but they are in a sunny and well lit part of the house. The humidity is not constant, but is generally between 40% and 90%.