[Python] Attach picture in e-mail

I have a problem with a Python script. It creates an e-mail with a pandas datasource. I would like to add one or more pictures but I can not. Without the pictures it works properly.

I ask you to help me in order to fix the problem.

import cx_Oracle
import pandas as pd
import sqlalchemy
import smtplib
import matplotlib

from email.mime.text import MIMEText
from email.header import Header
from email.mime.image import MIMEImage

image_path="C:\\Users\\n.restaino\\PycharmProjects\\pythonProject\\.venv\\barchart1.png"

def send_simple_email(host, subject, from_addr, to_addr, body, password):
# Instantiate MIMEText object
message = MIMEText(body, 'html', 'utf-8')
message['From'], message['To'] = from_addr, to_addr
message['Subject'] = Header(subject, "utf-8")
message = message.as_string() # Because SMTP.sendmail, required bytes-like string. Otherwise you will see error like: Error: expected string or bytes-like object

try:
import ssl
context = ssl.create_default_context()
server = smtplib.SMTP_SSL(host, 465, context=context)
server.login(from_addr, password)
server.sendmail(from_addr, [to_addr], message)
except Exception as e:
print(f"Error: {e}")
finally:
server.quit()
print("Email Sent!")

if __name__ == "__main__":
# Connection details
user = 'USER'
pw = 'PWD'
host = '10.0.0.1'
port = '1521'
db = 'DB'

engine = sqlalchemy.create_engine('oracle+cx_oracle://' + user + ':' + pw + '@' + host + ':' + port + '/?service_name=' + db)
my_query='SELECT * FROM T_C10'
df = pd.read_sql(my_query, engine)
ax = df.plot.bar(x='tipo', y='numero', rot=0)

fig = ax.get_figure()
fig.savefig(image_path)

host = "smtp.gmail.com" # Using Gmail server to send the email
subject = "[AUTO EMAIL] Report Sales"
html_body = f"""<h1> Sales Report </h1> {df.to_html()}
<img src={image_path} alt="The Python logo">
"""

from_addr, to_addr = "C.D@gmail.com", "A.B@gmail.com"

# Open the image file in binary mode

# Get Passwork from user
import getpass

password = '1234 5678 ' # getpass.getpass()''

# Sending Email
send_simple_email(host, subject, from_addr, to_addr, html_body, password)

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