In the database, along the left for each tank is the picture that appears in the research section of the game, where you purchase new tanks. When playing the game, if you pull up a list of who is in the room it shows a list of each player's kills and deaths as well as a silhouette of what they are driving.
My issue is there is no listing of what each tank's silhouette is, so it can be difficult to figure out what a certain tank is. My usual method is comparing to the screenshots in the wiki if I can't get an answer out of the player, which is cumbersome.
I can usually defer the tanks through their IG model, and their side silhouette. It's really easy once you have played for a while.