The art in this comic focuses primarily on atmospheric shading and texture, as opposed to itty gritty details. Fingers can look kinda funny without it, but from what I can tell, Bloodcarver’s hands are somewhere between a paw and lizard claws.
Claws can look much wider at some angles than other because of the layer of tough skin that gets abrased by ground contact.
And with most mammals, paws are actually much longer than we see, but they’re kinda curled over to better provide shock absorption and bounce when walking.

BC’s hands would be somewhere inbetween the function of both, but also be able to fully gesticulate like a human hand, meaning it probably looks pretty different when serving different functions. Here, he is stationary and is using them just as hands, so they’re going to be fully stretched out and appear narrow.

Its the kind of thing that never really looks right in fantasy unless you change it a ton for each scene. Buckbeak’s wingspan in the Harry Potter movies was shrunk significantly when folded, for example. The wings looked too big when true to his flying state.