Whats the background story for your OC to wash those hands?

She grew up in a sect that believed that the end of the world had come, we were just stuck in this world and one day, those who believe will receive a call from an angel, it will mean that it's time for you. Basically they believe in heaven's call-center Since the call can come at any second - you need to be always ready, more specifically clean. Washing your hands 10 times a day, wearing raincoats and storing personal things in packages is an important part of faith and if you do not obey, you will be hurt and this will delay your departure from this reality. It's a shame, right?
She keeps washing her hands more often then ordinary people even now, being old.

It's such a strangely specific thing, but I always really love how you use yellow tones in your work.

Yellow is the best, it comes to the drawings itself