I’m an archer of many years in RL so the bows in game show some elements that could use a look into.
Many of the bows have things that make them look strange - not fantasy detailing but other artifacts.
Bow string: the strings on many of the bows are “tied-off” somewhere on the bows limbs. This is inaccurate; it would impair the function of the bow as a good tool. The bow string should go from the very tip of the limb (or very nearly) to the other limb tip.
On the string itself - some of the bows have a red/black string; this is present on real modern bows where they use modern dacron i.e. Bonded Polyester Fibre not present in Diablo I would think. In all cases the string shouldnt be tired onto the bow stings and bows lose efficiency if not unstrung ( during “down-time” so “off-screen” so to speak) that is every string should end in a “loop” that hooks onto the bow and is not tied-off.
Bow Design: The bows should all taper out towards the tip. The physics of a bow require the tip of the limb to be very light and strong using materials like horn (but not metal) as strengthening materials. Ok we have magic at play which could change things up but it would be good/cool if this was somehow clearly the case.
Recurve bow skin/mesh designs show bows in the game which are designed from a “unstrung” recurve bow then strung as a flatbow. This look really weird.
In the game the “Flatbow” mesh is actually a recurve type bow.
the Iron recurve has limb tips that are just too “chunky”
The long shot is a good design following many of the right principles. I dont know why the arching handles are a theme on the bows (it would effect the bows “tiller” ( the quick version; visually there should be a spanned-hands distance between the handle and the string i.e. from out spread pinky finger to thumb like a “hang-loose” sign).
The makeshift bow is a good design if not for the “lumps” the string is tied to. the string in all cases should go from limb tip to limb tip.
Razorwind is a good design for a long bow or flatbow.
Revenant Bow is a good design
Serpent’s Bone Bow has the “chunky” limb tip problem
Siege Bow is very elaborate but ok fantasy design
Silver Warp-Bow is a bit beefy but is ok.
Weathered Bow Is really odd. To my eye it presents as an unstrung recurve bow. Its the “wrong-way-around”. The in game example has it stung as a flatbow. The quick fix to this design is to recurve the limb tips so it looks like the recurve bow it is.
Battle Bow has the “chunky” limb tip issue but its all fantasy design so cool.
Most of the other designs pass cursory muster.
If the bow is using magic to “make-it-bow” Id like a nod towards that. Give it an effect or some magical symbols or a glow or something so we know its “enchanted” to work. These might not be important I guess as it would only bug someone who knows bows. but wouldn’t most rogues know bows? lol.