Everybody will someday ask for the famous C&C (critique and/or comments), or has seen it when navigating the Internet on photography-related groups.
Critiques might be very helpful to develop other skills or to improve your photos. Or they can be helpful for future ones as well, because they provide another angle of view or techniques that can be applied later.
But, just putting "C&C are welcome" when posting the photo is not that helpful, because there is no direction on what to give critique on. So when people starting commenting, most of their feedback will be related to their personal preferences or what they like the most, and it might end up not being helpful at all for you to improve your photography.
If you want some helpful advice, you also should help people to understand what kind of critiques you want or what you want to improve in your photos by giving people some direction. Look at your image, and be the first person to criticize it. And then, let's say that you want to improve the poses of the people you photograph, the lighting in your photos, or the post-processing. People will be able to give you more specific direction (or even links to videos or articles) that will really help you improve on the subject and more quickly since they'll know what you want to focus on.
This way, you can benefit from really helpful tips and hopefully, improve your photography.
Lead image courtesy of Free-Photos via Pixabay, used under Creative Commons.