When including pictures that illustrate your findings, clearly indicate which pictures show the experimental and control conditions.  Use arrows to identify specific points of interest within the pictures.

Examples

(Wang et al. 2013)

Figure 2
The three distinct processes—motility, polarity, and directional sensing—that coordinate to bring about
directed migration toward the chemoattractant gradient ( yellow). The region of the cortex facing the needle
forms the front (blue); the quiescent back is demarcated by red. (Devreotes et al. 2017)