gesture! geeeeestuuuure!!!!!
im not feeling up to explaining things rn, i dont think id do a great job at it, so im gonna link to some great advice i got about a year ago now
at first, understanding when a drawing is stiff can be really hard. but as you develop your gesture drawing, itll become like second nature. its something you can really get a feel for with time.
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also, i think you could do with some studies on how long hair works. the way you have your long haired characters hair, it looks very shaggy, and not representative of how long hair works. most hair will all be the same length, with one or two off flicks - when drawn like you have, it looks like they have a tail attached to their head.
your shading on the armour in that splash panel is really strong, but elsewhere you could do with higher contrast and less white space.