I went to a yoga class once, and there was a woman there. Her feet were very flexible. As she was doing different poses, I noticed how strong and yet delicate her feet looked. It was inspiring to see how much control she had over her feet, and it made me respect the power and grace that feet can possess in the context of a physical activity.
You can assess if your novel will sell by researching similar successful novels in the market. See what elements they have in common and compare them to yours. Also, think about the current trends and if your novel fits in.
You can tell if your novel is good by the feedback you get from readers. If they are engaged, keep coming back for more, and recommend it to others, that's a good sign.
You can know if your story is good by seeing if the characters are well-developed and relatable. Also, if the plot has a clear beginning, middle, and end with some unexpected twists and turns, it's likely a good one. Another factor is if it evokes emotions in the readers.
You can tell if your story is good if it engages readers and keeps them hooked. If they can't put it down or are eager to know what happens next, that's a good sign.
One way to know is to look at how well your story holds your own interest. If you still enjoy rereading it and are excited about it, chances are it's good. Also, consider if the plot is coherent, the characters are well-developed, and the themes are clear and meaningful.
People with an armpit fetish can manage it healthily by being open and honest with their partners. If their partner is accepting, they can explore it within the boundaries of a consensual relationship.
I once had a friend who discovered his foot fetish for the first time at a beach. He saw a girl with really beautiful feet, delicately painted toenails. It was a sudden realization for him. He felt a strange attraction that he had never felt before towards feet. He was a bit embarrassed about it at first but later learned it was a common fetish.