>>5455366Just looked up Yuasa. So what you need to do for your next step is the lineart - block in those outlines and form your major shapes. Yuasa's work seems to rely heavily on loose, dynamic linework, so the foundational sketch should have enough movement to support that. Detail the face so the expressions comes through without being muddied by sketch lines or the rendering.
Next you need to look at rendering. It looks like that figure is naked so you should only have to worry about shading a skin material (ie. No hard reflections or drapery). Yuasa only seems to use two colors on his forms, one for the base and one for the shading. There are many ways to render so find a way that suits you. I usually do a pass of the base color and then apply shading on top.
Yuasa's use of watercolor adds a dimension of texture and variety to his rendering. On trad, you can replicate this by just using watercolor. However on digital, perhaps use a few close colors around your base color on your first pass to achieve that affect. You could also use a textured brush.
You'll need to set up a light direction and apply shadows by imagining the 3d form of the figure. Yuasa's work seems to mostly apply downward lighting, if at all. Personally I prefer cooler shadows, but that depends on your scene.
Consider adding a one color background to help the figure stand out against it.
Of course, you could stop at any time during this entire process and call it finished. It really depends on the "completeness" you're going for. But in comparison to Yuasa, you must add the lineart and rendering.