i got a poka-dot plant this past summer, since then it has grown about a foot. the nice thing is the new plants forming at the base of the others. the light wasn't great for photo taking but you can see some of the newer plants in the pics.
Your polka dot plant (Hypoestes phyllostachya) looks nice and healthy:) They tend to get leggy over time, but if you keep pinching it back now and then, or take cuttings, it will stay more full looking.