Edit 4/7/2015: Updated the image to make it hopefully slightly easier to understand. Still lots of info crammed into it but oh well...
Apologies for how messy this is.. I know this is uploaded at night but i scribbled it in the morning.. really early in the morning >_>
If you know what i'm talking about please let me know so i can credit them!
Translated to Portuguese here: sulamoon.tumblr.com/post/11582…
Translated to French here: fav.me/dbhai36 by Nooknook
No attack on you, however It's as close to a visually understandable interpretation of an unquantifiable process that can probably be inferred, in my own opinion. Most in this field have a personal understanding that it's often sporadic in all it's twists and turns of process or stagnation, but slowly overtime it does eventually lead upwards to an improved level of skill compared to before. If that's any consolation.
I wanted to add a little thing cause I think that this is an optimistic graph in a way. Since if you stop practicing you usually lost some skill and in my opinion some people may think "well I'm in an art-block, that's why what I do is shit" and not really think clearly about the lack of practice and so on