Sniper's appearance is similar to Basic as it's composed of a circular body and a single cannon, the only difference being that the cannon is longer.
Although similar to Basic, Sniper has a few changes that can help it in certain situation, like it's increased FOV (field of view) and it's higher damage and bullet speed, but those come at the cost of it's reduced reload and speed, those being around half of it's predecessor's stats. It's also considered a easy target for higher tier tanks.
On pressing G
On right click