This tutorial will show you how to make lineart with the Java Tool.
1)I always draw with the floating mode on, and arrange the palettes to the positions I customized them to(like in photoshop). It lets me draw much more easier and efficiently.
2)Next I start my sketch with the pencil tool(size 2-3). I always flip my image to check if it looks weird on the other side.
3)Add more details and make alteration(if necessary) when sketching. It will save you a lot of work if you get the sketch right before drawing the actual lineart.
4)After finishing the sketch, I add a new layer by pressing the "+" icon on the layer palette. Then I lower the opacity of layer 1(the sketch) to 30-50%, and start inking the lineart with the pen tool(size 1)on the newly added layer.
Important: Never draw your lineart on the default layer in Java. Since the default layer is white instead of transparent, when you draw your lineart on the default layer then your coloring will not show under the lineart.
5)If you are a mouse user, you can try to set your mouse's speed slower to help youself draw more steadily; and you can increase the option "smoothing" to produce smoother lines(higher setting requires more computer resources tho)
6)I always zoom in and out to check if the lineart looks clean and tidy.
This is only a basic guide to lineart making, hope it helps for those who want to make their own lineart~ ^_^
(I hope I explained it well...)