The clue from pycto #1:

"If you do some research, this picture contains TWO clues about me"

Obviously, it's a gun. But, a reverse image search would lead you to that specific gun's wiki page, where it is known as an FN P90, also considered to be a submachine gun.

The first clue is "submachine gun," which is often abbreviated as "SMG." The second clue is in the model number "90." SMG are the celeb's initials and 90 is her DB number:

Sarah Michelle Gellar

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The clue from Pycto #2:

"I am NOT the celeb pictured, but a tweet of mine led to me playing the character pictured in 2015, battling a character who has teapots for friends."

The celeb pictured is Camila Cabello, playing Cinderella. After a tweet, sharing the "Snow White vs Elsa" Princess Rap Battle, Gellar played the role of Cinderella in a 2015 Princess Rap Battle, facing Belle from "Beauty & the Beast."

https://www.youtube.com/watch?v=VeZXQf77hhk

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The clue from Pycto #3:

"Wastin' time with all the chatroom yakkers? Two more clues in the music video. The numerical clue in Clue #1 will allow you to skip ahead, taking you less than 10 seconds to find me."

The screenshot and the lyrics "Wastin' time with all the chatroom yakkers?" are from "All About the Pentiums" by Weird Al Yankovic. If you got the "90" from the first clue, you could skip to the 1 minute, 30 second mark (90 seconds) where, less than ten seconds later, you'll hear the lyrics "Hey fella, I bet you're still livin' in your parents' cellar Downloadin' pictures of Sarah Michelle Gellar."

https://www.youtube.com/watch?v=qpMvS1Q1sos

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Thanks for playing! Hope everyone enjoyed it!