Wow, thanks! To be honest I really don't understand what I'm actually doing when I'm improvising. I don't think, "okay switch to Gm7 Harmonize the right bring out that underlying melody...hmm..9th chord would be nice here." My though process on the subject is MUCH more simplistic. It's more like, "hmm...that sounds nice"(Hearing in my head) and play.
That's a good process, I'd stick with it.

It's good to work on theoretical things in isolation from time to time though as they can open up many new possibilities. I didn't understand what I was doing when I started out and to this day I improvise at my best when I'm not thinking technically and in some sense "don't know what I'm doing".
That sounds awesome but I'm not entirely sure how to achieve this(Self taught so I have little Music Theory. Everything is from the net and talking to musicians). Btw, I never thought to play 9ths..HMM! 
Experiment! That's all I can say; 9ths, flat 9ths, sharp 9ths, 11ths, 13ths...... but also:
I was playing around with the intervals on the chart you posted earlier today and LOVED the harmonies! I'm not entirely sure on how to use it (Safely/correctly) though.
Learn these basic three-note voicings on the chart,
thoroughly, first. Listening carefully all the time. It'll take a while but it'll be worth it. Internalize the sound and the feel of these chords and you'll gradually be able to use them however you want to.
Also, with regards to the chart, see how many patterns you can spot. There are many, some more obvious then others. Are there any chords that repeat for example? It might help if I post a blank chart (no chord labels, see attached). You can use it to help you check that you can recognize all the chords. This is all information that needs to be memorized anyway.
Note: the awesome II-V-I chart can be played vertically. Try starting at bar 5 (measure 5) and then playing the bar immediately below it on the 2nd line, then the 3rd line etc.
By the way, a detailed explanation on the 2-5-1 progression would be GREAT!!
How much musical theory do you already know? That'll help me to give a better explanation.

For now, try to get familiar with the sound of 2-5-1 (every 2 bars on the chart is a 2-5-1 progression, just in case you hadn't already figured that out) and then see if you can hear it in being used in pieces of music. "Twilight Shore" by Joe Hisaishi, which you mentioned, has a few good examples, mostly later on in the piece.
"Autumn Leaves" - Youtube mixtapeThis song, as I've already mentioned, uses a lot of II-V-Is (and the circle of 5ths). It was the first piece I learned when I went for jazz lessons. There are thousands of recorded versions of this tune. My jazz piano teacher gave me a mixtape of "Autumn Leaves" recordings when I started out, so this is what I'm going to do for you, albeit in youtube form!
To get a feel for how the original melody goes, without too much embellishment, I would recommend this Nat King Cole version:
Nat Cole's version is in Dm. Usually when jazz musicians play this tune they play it in Gm . Here is a more modern take on the tune with the chords written out underneath:
https://www.jazztheorylessons.com/2009/02/autumn-leaves-chord-progression/All the chords you need to play through this tune are on the II-V-I chart (you can ignore the flat 5ths and 9ths to begin with and just play basic voicings ie. Am7 instead of Am7b5 and D7 instead of D7b9). This website has loads of good info on jazz theory and has the advantage of a comments section for each of the articles, which also often provides further insight.
Another essential interpretation is this one by Cannonball Adderley, featuring Miles Davis (also in Gm):
This is a recent one that I've found. It's a solo piano interpretation in Gm. The tune is barely recognizable but it's a beautiful version and the pianist has actually taken the time to show us what notes he is playing on a piano chart at the bottom. It's quite advanced stuff but very instructive:
Can't really leave the Gm versions without mentioning this one with Michel Petrucianni on piano:
However, my favourite version from the mixtape is this obscure Dudley Moore one which, by a happy coincidence, has recently been uploaded to youtube. It's in Bm and it's a riot

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Thank you so much for the info man. I truly do appreciate this
.
You're welcome.
