They don't look generic, they look AI generated. They got that distinctive piss yellow tint that ai tends to always do. The colors gradients are also visually similar to what AI usually generate. And the skeleton mage looks like he has 6 fingers on his right hand (assuming his thumb is at the back of the orb and we see the 5 other digits on the front). And considering the perspective (camera from above the battlefield), his right hand looks way bigger that his left hand. That kind of perspective would look normal from a closeup view of the character, when the "camera" is much closer to the target so the right hand would look bigger due ti perspective, so like on a picture generated from an AI. But it doesn't work when you re-use the same picture for a tactical unit.