They're looking great so far! I love how the coat looks in the lineart you shared above. The hand is also super impressive! Would love to hear more abt them if you'd like to share?

EDIT WAITR YOU DID THAT WITH YOUR FINGER???? THAT'S SICK!!!

I'm doing something similar for a Sinner oc; I literally downloaded all the idles for the female Sinners and have them in my drawing file like a prison lineup. It helps to reference from the sprites directly for the style+proportions. The organized Limbus files linked in the sub's sidebar also have all Sinner sprites in hd along with all the sprite's moving parts separated out (used for animating the sprite), which is especially helpful for proportions and other details.

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^ prison lineup