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I looked through your posted work and I'm curious if you've ever tried working with charcoal? You can get some really dynamic tones if you learn to switch off using vine and compressed charcoal with a few different types of erasers. Pencils are nice because the fine tip forces you to focus on those details, but learning how to get those details with charcoal can be really rewarding when you figure out a way to get those darks down really hard. Given the medium though, there's really nothing I can say about this other than good job!