This is what a twitter account looks like for a new or infrequent user https://twitter.com/biffcantrell
The “egg” is the default icon twitter gives new users.
Compare that to someone who is more active https://twitter.com/p3dr00 – what can you learn from the profile? From the indicators of their activity?
To customize your profile via a computer, see Twitter’s materials:
On the twitter iPad app you can find these settings under the “Me” button on the left, then click the Gear icon, and Profile from the menu.