MP...
Your Ju88 is not from 11.Staffel, but 9th. The unit emblem is for 9./KG76 and your aircraft would have been coded F1+?T, where the ? is the individual aircraft letter and T is the 9.Staffel identifier. 9.Staffel's own I/D colour was yellow, so the ?, whatever it was, would also have been yellow, or possibly black outlined in yellow. In theory, the propellor spinners usually confirmed the Staffel status and therefore, part (even a very small part on the tip) or possibly all of the spinner should also have been yellow, although this appears not to be the case from the photo.
The aircraft in the background, with the light coloured letter 'A', if from the same Staffel and unit, would have been F1+AT, with the 'A' in yellow.
From
'Bomber Units of the Luftwaffe 1933-1945 - Vol.2' (Classic) by de Zeng and Stankey, it appears that III.Gruppe, KG76 - comprising 7., 8. & 9.Staffel - used the Dornier Do17Z until around December 1940, when personnel removed to Illesheim, Germany, on leave and then spent the next three months until March 1941 converting to the Ju88. After conversion on the Ju88A-5 was complete, III./KG76 relocated to Châteaudun during the first half of March, 1941.
If you don't already have, but would like an idea of the basic colour/coding structure for Luftwaffe units during the war, you could try
www.Luftarchiv.de. When you get to the front page, tick 'Agree' (or 'Ich Stimme zu' if you've got the German language version), and from the left-hand menu, select the following: Luftfahrtindustrie, then under the heading 'Kennzeichen', select '1939-1945'. You will see the grid and be able to follow the last letter indicators for Geschwaderstab, Gruppenstab and Staffeln and their respective colours. As ever, there were many anomalies with the Luftwaffe coding system as you might already know, but then, that's part of the fun and interest in the subject...
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Hope this helps...
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Regards,
Paul