The number one thing is to get constant, honest, reliable feedback, and be able to take it.
I think the first thing to do is to find a community, which it seems you are doing, that is knowledgeable about cinematography. In every art form, its important to share your work with people that you trust to give honest feedback. Its also important to develop the strength to accept that feedback and do something with it, rather than reject it or have an excuse. You can differentiate a pro from a newbie by how they respond to feedback. Newbies make excuses (Oh it looks that way because---- and it wasn't my fault), and pros take a good hard look at their work and what other pros have to say honestly about it, and then they learn from it and make the experience a strength on the next shoot. Present your work to folks who want to break your film down to the smallest of components and analyze it for better or for worse. That takes guts, and its how you improve with practice. I'll take a look at it!
I'm curious if could break it down for me. Are you talking online or in the physical world? If you're looking for communities to give you critic or insight, that's one thing, but if you're talking distribution, getting your film seen, thats a different answer. Youtube is likely to get you more off the bat views (day one), but Vimeo is a much better community. Viewers on youtube don't tend to look too deeply into the content beyond "Did I like it? Or Not?" and move on. Vimeo's community is much more into the art, the work you put in, and you're more likely to find people who want to know more about your film, how it was made, or even make connections. It also tends to look better on vimeo, no ads, cleaner look, and often higher quality depending on how you compress it before they compress it. They also allow you to target your audience, where as youtube is just "put it up and hope someone finds it!" Vimeo's 'groups' system lets you choose groups that are related to your project and its content. For example, I can post my film in a group that is about the film's specific camera, or the genre, or a theme (there's 20 groups for every subject) and then my film will show up in the feed of that group. If you don't mind risking being obnoxious you can remove and repost your films into the same group or more and more other groups, maintaining a steady stream of fresh looks into your films. This way your video has the potential to not get lost in the internet on day 2. Provided I am finding the right groups, I typically get more views on vimeo than youtube, but it takes effort on your part to produce results. If you want maximum views and attention you've got to promote your film, look for the groups, share it on social media. I recommend getting your friends together, everybody makes an account and everyone adds the film to 7 groups, so on day one, the film is seen by a huge amount of people. Then you develop followers, build and audience and such. If you put in the work, vimeo is the best option. You'll meet people who are into quality as well as entertainment. I'm often messaged by people suggesting their film fests and programs to me as well.
If you knew all this, sorry! I wasn't really sure what you wanted. Specify for me and I'll try to help.