Hi Anastasia, welcome to HubPages. The number on your profile picture is your score--your Hubber Score.
"HubPages has developed two ranking methods, known as HubScore and Hubber Score, which like the herbs and spices Colonel Sanders uses on his chicken, are shrouded in secrecy."
The way to improve your scores is to keep on Hubbing. Here is the link to further explanation.
All the best!