def tabbedPics():
   Notebook = ttk.Notebook(root, width = 317, height = 230)

    dinoFrame = ttk.Frame(Notebook)
    Notebook.add(dinoFrame, text = "Dinosaur")
    sizeFrame = ttk.Frame(Notebook)
    Notebook.add(sizeFrame, text = "Size Comparison")
    Notebook.place(x=900, y=220)

    dinoImg = ImageTk.PhotoImage(Image.open("dino_images/Anomalocaris.gif"))
    dinoLabel = Label(dinoFrame, image = dinoImg)
    dinoLabel.place(x=0, y=0)

    sizeImg = ImageTk.PhotoImage(Image.open("dinosize/Anomalocaris_size.gif"))
    sizeLabel = Label(sizeFrame, image = sizeImg)
    sizeLabel.place(x=0, y=0)

from tkinter import *  # Wildcard imports are bad.  They clog the namespace.
from tkinter.ttk import *  # But if you wildcard import tkinter, also do it for ttk
from PIL import ImageTk, Image

def tabbedPics():
    book = Notebook(root)  # Variable names should be lower case and should not be function or class names.
    book.pack()

    dino_frame = Frame(book)
    book.add(dinoFrame, text="Dinosaur")  # Convention is to use snake_case instead of camelCase.
    sizeFrame = Frame(book)   # Can go against convention if good reason.
    book.add(sizeFrame, text="Size Comparison")

    dinoImg = ImageTk.PhotoImage(Image.open("dice1.png"))  # I used some image files I have laying around
    dinoLabel = Label(dinoFrame, image=dinoImg)
    dinoLabel.pack()

    sizeImg = ImageTk.PhotoImage(Image.open("dice2.png"))
    sizeLabel = Label(sizeFrame, image=sizeImg)
    sizeLabel.pack()  # Only designer programs use place.  Use pack() or grid()

root = Tk()  # Added this code to make a a window to display the notebook.
tabbedPics()
root.mainloop()