You will need to set up this new profile from scratch, as nothing will carry over from the first profile.
Click your profile picture in the top-right corner, and then click the camera icon underneath your current profile picture.
Otherwise, swipe from left to right on the screen.
Ending thoughts In my experience, this feature of keeping separate profiles with different theme colors and profile pictures is quite handy.
You can access old profile pictures and other Google account pictures using a tool offered by Google.
Also be sure to check out our similar story wherein some users are rooting for holiday-themed versions of Google Apps icons.