Hello, I hope I didn't overwhelm you. I have checked your arts and I wonder, how you learn this? What do you suggest for first step? Inkscape really what I need to drawing program for my first game. I hope you reply me.
Trace over images and keep practicing. It took me a few months of practice to be able to produce my current quality of art, if I tried to free hand, it would be garbage. Try to break down what you are looking at into simpler shapes in your mind. When shading, squint at your reference material to make that process easier and figure out the major shapes and colors.
This is what I was doing back in September of last year versus my current quality. Just keep trying to recreate images.
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though it doesn't go very indepth. The process is pretty simple, import your reference image and use the bezier tool to start outlining the major parts of the image. Sometimes you need to consider how the different parts overlap and not just trace out the entire thing as one shape. Like in the showering image above, the right and left arms are separate shapes from the main silhouette of the body to allow the hands to lay on top of the body.
Good luck, if you have any more questions or run into problems with Inkscape I'll try and answer them.