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Well primarily you have no frontal light source. You need to get some soft light (at the same temperature as your LEDs) coming from the front/above.
I literally use three desk lamps and a big softbox light tent.I invested in a huge roll of 200 gsm paper which I hang down the back and under the subject (gives a flat pure white finish).
You need to manually set your white balance to a cooler level - either in-camera or in RAW processing.
Then make your exposures longer and lower your ISO.
