You NEED a digital pen. I can tell from a 6 years experience in that field that without a digital pen, you'll stay stuck and won't improve.
Sorry if that sounds harsh but to provide professional quality work, you need pro gear + training with that equipment.
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Send me your gmail adress by PM and I'll share some working documents with you.
Main issue is that even if we're not super advanced in scenarios... we're blocked with illustrations... it's hard to find artists that fit our expectations... but we'll manage I'm confident