Well I’m not the best artist myself but I would say:
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Like the other comments, take your time and use layers Omds layers can save you from have to rub out everything. I like to work on separate elements especially the small details then I combine them together so I can always remove or change one element at a time
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Have confidence in yourself! not everyone needs a fancy apple pen to create amazing art, when you make confident, quick strokes it looks better
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don’t be afraid of contrast! Study the skin tone well and you will notice the outlines are a few shades darker than the skin tone. Shading well and creating contrast gives depth.
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Start with a base colour for your skin then use that colour and either go lighter or darker for your shading
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for see through objects: yet again don’t be afraid of contrast. Using off-white lines for outlines then use the same colour but reducing opacity to go over and colour on top of whatever you want to be shiwn (eg the see-through sleeve).
—hope everything goes smoothly!