I think we'll need some context to provide helpful feedback. What is your goal, what are your skill level and experience?
If as I suspect you are a beginner, I'd strongly advise to practice small pieces first. You'll get lost and discouraged if you embark at once on game assets, as it looks like.
One tip already: blocking out shapes with a large pencil is a good start, but make sure you use a single color hard pencil, not a soft brush, and disable all auto-anti-aliasing, feather, brush dynamics etc. Otherwise you will only litter your work with thousands of unwanted colors, which will give you headaches in further stages.