Tell us about yourself!
I don't know that much about Inkscape. I usually use bucket tool or the Fill and Stroke panel (Ctrl + shift + F) to change color. Select the small area you want to color, then go to the fill tab to play around.
Thank you so much for the tutorial! In my second image I filled color using bucket tool. In my third image I changed the color of lines, so the image looks sharper. Do you have any suggestion on changing the width of lines? And how to color (specifically shading/ textureing)?