I really like the photochallenges @oldtimer... but, like you, I do relatively few of them.
One thing, though-- which you have also done here-- is to turn the challenge that could be posted as simply a photo and a sentence into something more. For example, I'm probably going to do "color challenge" today, but it will be multiple photos and the text will be a "teaching piece" on how to take something plain and ordinary and turn it into something more so it stands out from the crowd.
Your reflections photos are lovely; especially fond of the top image with the Japanese garden.
I cant compare with you, my friend. I'm an amateur. But really appreciate your opinion.