Tips on drawing a circle?

Your question is awesome bro!, this struggled me many times, and as now I'm happy with the circles I can draw they are still far from being a perfect one.

In my experience, there is no right answer, because there can be many reasons why the circle just don't appear, but the important thing is that simply is there no meant to be. Is not the faq that you can or cannot draw the circle, but releasing yourself from the struggle of it, This itself can be aplyied to the main proceess of Art. Creating a beautiful composition will not happen just with three quick lines, It's a pacient process where (As you draw) you must think before actually make another line. Don't move the pencil if you don't have at least an idea of where you want it next, and when you move it, it is tracing the path you want? if not, stop it! correct the angle and keep going but always without erasing what you did before, because that can be corrected in the future. That's something I have learned from the old masters. We want perfection, there's nothing wrong in that, but in order to archive it you must see perfection also in the most weirder figures, because world itself is weirder.

You already have the practice! now you have to add a little of consciousness into the equation and voila! you will have a perfect cicle! to resume, my best advices will be: Draw slow but with flow, don't finish the line if it is not going where you desire (Stop, visualize the circle and fix the angle of the line, and then continue the same line where you was, always without releasing the pen, we don't wan't to broke the line).

One last thing that actually happened to me. I realize time ago that my hand was to "Heavy", is not something people talk about because actually most people is "Light handed", so is hard to notice. Was kinda hard to maintain my hand pulse right because of this, so I actually have to kinda rise my elbow. Is uncomfortable at first, but it will come handy with practice, this way to draw helped me with my lines!.

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These are my clircles, they are far from Perfect circle made with a tool, but I'm okay with that because they have more rytm and flow than a "Perfect one", wich, at the end, is what makes my work recognizable. So they are more useful for imprinting energy in the composition!

@shark There are some great tutorials over at Drawabox.com that might help. Are you ok with drawing boxes? If so you could always try that cheat and draw a square and then draw your circle within. If that is difficult you could divide your circle in 4 parts and then you just have to draw one part of the circle at a time. (This was such a great tip I picked up for drawing circles in perspective.)
I know your question is more about drawing circles freehand (I'm assuming) but why not use the circle tool in Manga Studio if you need a perfect circle? Personally that's what I do- I sketch everything out and then use the tools to give me perfect (?) circles and lines....
Good luck!

I think everyone has said all the possible options

Practise, tools and tricks in understanding circles but what I myself thought as an eye opener is: 1.purpose and 2.how you use your arm while drawing.

First of all, what is the purpose of drawing your perfect circle? Does it really have to be a perfect circle or will any circle do just fine? @luurquiola has a great explanation and example about this.

One other thing Luurquiola mentioned was his 'heavy' drawing. I'm not exactly sure what it means but how you use your arm is quite important. When drawing circles make sure your wrist and elbow do not touch the paper. This forces you to draw from your shoulder. With your pinky (and maybe ring finger) on the paper as a reference. You will have more muscle control that way.

Doesn't mean you can't use your wrist or elbow at all, try for yourself what work best. Curved lines, details will most likely come from the elbow/wrist. Some say it has to do with workspace, but from personal experience, I never found that being the reason.