The style of the illustration is supposed to be different from what can be commonly observed for scientific illustrations.
A modern feeling can be suggested by combining a realistic aspect, a minimalist style and a certain sense of lightness.
Realism and modernity can be achieved by creating a 3D illustration (3D modeling is the best representation for a realistic style).
The composition should integrate a limited number of elements to present the main subjects clearly: the hourglass on one side and immune cells on the other side.