This tutorial explains how to create a more realistic images using the following tools: 1.fill tool 2. transparency 3.air brush 4. pen 5. line... creating much more realistic drawing takes a lot of time and ink so be sure to plan you drawing or do the guide first then color it. goodluck and have fun! :D
create a sketch first using the guide options then start fill in the base colors using the fill tool or any tool that you prefer may do.
start filling in and blend colors using the transparency options. for example filling a transparent wings, simply change the percentage of transparency lesser than 20% and start blending it in.
use the spray tool to soften the edges of your object. start filling in your highlights to create depths on your drawing. mostly i will use spray tool and fill tool to blend colors to create a good highlights.
Now for the last step, just trust your instinct! :D as an artist you have all the tools with your creative mind, enjoy making drawings and explore!