Hi, I just had couple really good feedback in my opinion that can improve the game and adds immersion to it so here they are:
1. Adding new character animations. random AFK animations. more fighting animations (wrecking blew suffers from this deeply). perhaps consider adding animation for a character each time he ends a boss fight, or finding a treasure chest. things like this can add life to the game and makes it more interesting.
2. random NPC reaction after killing all his pack and he is the only one left. maybe running away in fear? this doesn't break the game if you know how to do it without effecting the actual gameplay. and it can be done. altho it doesn't has to be an animation it can be some phrases of anger or fear.
3. randomly changing weapon wielding animation while out of fight (2 to 3 animations are enough) .. and this animation can be changed to the current animation as soon as attacking someone or being attacked by someone. this is an mmo and while we are in a group of friends with the same weapon type and we all holding our 2h swords in the same exact way makes it really odd. in any case this small detail can make the game look more beautiful.
4. Large reward upon finishing all quests and activities in one zone. it can be XP or set of gear or something that can only be obtained by exploring and finishing a whole zone. this will encourage players to do quests and explore the game and it can impact on the game really well. BUT, it has to be really worth it. it has to make you do even if you are maxed gear or level.
5. Make pets meaningful and have purpose not just following you. (This was already discussed in ESO live) but I just wanted to mention it because it's really cool future.
for now these what came to my mind while in game and I hope it can reach Zenimax team. let me know if you guys agree or disagree with those points.