After finish animating each shot in TVPaint, I will export every individual bean into separate png sequence and put them into after effect. By doing so, it gave me more freedom on adjusting sizes or moving them around. but also creating shadows.
By using the 3D camera in after effect, I can easily place the original footage onto a flat axis and simply add effects to fill and blur the layer, which that will create a ‘shadow-ish’ image. After that, turning the opacity down and change the perspective of the footage, which will give it a really nice shadow.