Half-note with a flag

[John Kliewe]

Hi,

I am trying to create a measure like the attached, from Chopin's Nocturne #3.

Here is what I have tried, but neither approach is quite right :

\version "2.16.0"
upper=
\relative c''
{ \clef treble
  \time 6/8
  \key b \major
r2.
r2.
}

lower=
\relative c'
{ \clef bass
  \time 6/8
  \key b \major
<< {cis,2 s8} \\ {
\once
\override NoteHead #'transparent = ##t
cis8[ e8 b' gis e' b]} >>
<< {cis,2 s8} \\ {
cis8[ e8 b' gis e' b]} >>
}

\score {
\new PianoStaff <<
\set PianoStaff.instrumentName = #"3."
\new Staff = "upper" \upper
\new Staff = "lower" \lower
>>
\layout { }
\midi { }
}

Any advice? 

Chopin.gif
Description: GIF image