Alfied
I'm not familiar with the game itself, but I googled and looked at promo images, and I'd say you need more shadows for depth. I don't use Unreal, so I can't give you any technical suggestions, and if it doesn't need to look photoreal, like you said, the only thing I can say is in the images I saw, there seemed to be a lot of shadows and depth--maybe a bit more contrast overall than yours. Also overall, I'd say more vivid colors, and not so bright.
The lipsync is pretty good and your motions are smooth. It does feel like she's actually singing (I used to sing, and you get into it like that). You've got some nice camera angles, and overall movement, so I'd just say work on colors, contrast, and shadows to add a sense of depth.
These are what I'm basing the above off of:
Hope that helps!
Nicole
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