Here is a 20 minute video for anybody who hasn't seen Eiichiro Oda Draw and would like to:
Also here is an interview about it, which also is shown on screen while he is drawing:
Spoiler showHOW TO MAKE COLOR ILLUSTRATIONS
[Rough] Decide the basic layout.
Q: What’s the feeling at the draft stage?
I don’t think much about whether the lines are going right. When I’m drawing, I try to think about what the characters think, and getting the expressions right is important. Where my pen goes doesn’t matter.
[Pencils] Draw a draft in pencil over the rough.
The pencils are complete.
Before inking with a G-pen, simply use an eraser to make the pencil lines fainter.
[Inking] Draw the outlines in ink with the G-pen.
Q: What do you think when you work.
As I draw I think ”What is this character thinking about in this situation?”, and ”if this character is doing this, what should be around him?”. So pictures of a character who is not thinking anything but simply striking a pose feel wrong, and I’m not good at them. I’d like people who view the picture to think ”What’s going on here?”. I would like them to stop and use their imagination, and to spend a time looking at it.
The inking is complete.
[Shading] Color the black parts in with a marker pen.
Q: Any message for young people who want to be a mangaka?
Basically, the media of manga is pointless if people don’t enjoy it. If you want to become a mangaka, be prepared to spend a lot of time on it, and make sure you try to make people enjoy your work.
[Coloring characters] Use colored pens called ”Copics” to put in the color.
Q: What do you need to watch out for when coloring?
Not to go over the lines, I guess. Also, for a normal color picture, use lots of color.
Q: You are coloring the skin first, is there a specific order to the coloring?
It’s not fixed, but I color the skin first, it’s an important part, so I can feel relaxed. Also, if there are a lot of caracters, since the skin colors are almost the same, coloring it all at once brings out the mood of the picture.
Q: Is it better to color with Copics than use a computer?
Copics are better, I think. Also, I’m not used to using computers, even if I was, pictures colored by computer are boring, aren’t they?
The shading is all the same, in fact, various techniques have been developed, but in the end, they all have a rhythm so that the shading always looks artificial to the human eye. I’ve always done ONE PIECE this way. I think readers would be unhappy if I suddenly changed.
As long as I draw ONE PIECE, I’ll do it this way.
Q: Do you like the coloring stage?
Q: Is there anything you are careful of when coloring?
Nothing in particular, but… I’m mindful of things with things with different textures, such as skin and hats. Red is a good color for Luffy’s clothing, don’t you think?
Q: What image do you have?
I guess my image is red. The character have set colors.
Q: Are you influenced by any other artists in terms of coloring styles? Do you have a favorite?
I like all the artists I liked when I was child, but I don’t really take inspiration from anyone. I don’t have a stronger desire than anyone else to color beautifully. I think the most important thing is the feeling.
Q: How old were you when you started to draw manga?
I was drawing manga-like things in elementary school.
Q: Did you already wanted to be a mangaka at that age?
I decided that when I was four. I liked pictures, and I found out that there were adults who drew manga for fun, and then heard that there were adults who draw manga all day and get paid!
Q: And that’s why you decided to become a mangaka?
I thought that if there was such an enjoyable job, then I had to become one. I heard that there were people who didn’t need to go out early everyday to work and then come home late, but could just draw manga at home. I knew I had to go for it. Well, at that time, I didn’t realize how tough being a mangaka was.
You should color the sky many times or else it will appear patchy. The simpler an area is, the more coloring it will need. I used to think it was impossible to color sky without it getting patchy, and so I’d always draw with a pure white sky. That’s why my early illustrations all have white sky. At one point I forced myself to color it.
Q: What do you care about the most when you’re coloring?
Vividness. Color usage that is fun to look at. For large pictures, I always draw small test copies on separate sheets, and I try coloring them many times. Then I choose the best, most fun color and start to paint.
[Finishing touches] At the final stage, white pencil or paint is used to make small corrections and finalize the art.
Q: What are you doing now?
I’m adding a little shine and lighter areas to give more depth to the picture.
Q: Is that a normal white pencil?
Normal colored pencils won’t show up above Copics, so I tried many types.
Okay, it’s done.
I know we have a lot of artists in this forum so I hope this video helps you learn anything you needed to know. Also it's just fun watching this as a fan of Oda. I hope you guys enjoy.
Also sorry if you have already seen this video or if somebody has already made a thread about it. :)