Work for author Matthew S. Cox and his books, "The Awakened" series. This is book 3 of 6. I did this last year, I think, back when I stayed in Bali. You can buy the book here: https://www.amazon.com/Grey-Ronin-Awakened-Book-3-ebook/dp/B07GTF9TTZ
https://www.artstation.com/artwork/JlrbOv
https://www.artstation.com/artwork/v2Ag8Y
https://www.artstation.com/artwork/kDlv8d
https://www.artstation.com/artwork/g20B8G
https://www.artstation.com/artwork/D5LRWG
https://www.artstation.com/artwork/rAzY12
This series is like futuristic Avengers, right. Different characters each chapter, then join forces in the final book. This time is a Japanese guy with a power to increase his reflexes i.e. slow down time, gave me the matrix-like idea of slow-mo bullets.
Bullets don't really create trails like that in real life, but they do in water, which is what I was trying to achieve :D
thanks for viewing !! :D