one thing I tend to do is draw the "main colours" of the characters when their face isn't visible to (hopefully) give out who they are. So I do hope that it comes across! Ottilie being green and Asimov being blue
shape language is also another thing! Asimov usually has more rounded shapes whereas Ottilie has square/intricate shapes. This applies to their design as well! The hair bun of Asi forming a rounded shape whereas the hairband of Otti forms a squarish shape!
They're more so at the horizon so looking straight up would put them out of view! Didn't forget this time kek, just isn't a view where they'd be visible
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Feet in specific I have no strong opinion on, legs I very much love