from reportlab.pdfgen import canvas
from reportlab.platypus import Image

# ...

pdf = canvas.Canvas(
    filename,
    bottomup = 0)

# ...

logo_image = Image(
    "%s/images/wsp_logo.jpg" % settings.STATIC_ROOT,
    width=200,
    height=200)
logo_image.drawOn(pdf, 100, 100)