The Venus Flytrap is very variable but generally has green traps with red inside the trap from a slight blush to a deep red. Traps are produced during the growing season with taller more upright traps growing in the summer. Trap size does vary from 1-4 cm.
Standard size plants are in an 8.5cm pot, a mature plant.
Large plants are in 11cm pots and have divided to form a clump and so have more traps and form a bigger rosette.