Each generation of phone means an upgrade in camera and software. They are impressive, on par with many SLRs of a couple of generations ago.
As observed above, photography is all about light. How the light is to be used or manipulated is totally dependent on the photographer's vision of the shot and the intended end use. I've sold files taken with phones, mostly scenics, today's iPhone excels for this. Other phones may also, can't speak to them.
Cell phone cameras are certainly more than adequate for pics to be posted on-line, if the light is used to advantage. Eliminating "hotspots" is as easy as diffusing the flash or, dispensing with flash totally. Check your settings prior to the shot to minimize "post" time. See the light!
If I had but one piece of advice it would be, stabilize the camera and use the delay for the shutter.
Perfection is tough without the proper monitor, printer, video card, etc. all correctly calibrated to the color scale used in the camera. Most are not going to spend a few grand to achieve this. There is no reason to do so as most are not viewing the small, on-line files with a monitor calibrated to what the poster was using. My monitor, on the computer I'm usually on is calibrated to sRGB. I suspect most of you haven't given such calibration a thought or, have a monitor that can be fine tuned.
So, in a nutshell, do the best you can with the equipment at hand and, post away! Not all here are viewing your pics with a well developed eye on large, calibrated monitors.