"Check out the dark-yellow overspray over the panzer grey on the big field-guns, and the 88, which appears to be in dark yellow...I think this is probably a mix of pics from Tunisia and perhaps Sicily/ early Italy..."
The guns in the pic from front to back are
1) 8.8cm Flak 18, basecoat dk grey w/worn dk yellow repaint
2 & 3) 10cm Kanone 18, both appear to me to be dk yellow with a darker camo atop the basecoat of dk yellow
4) 15cm sFH18 Haubitze, all dk yellow
5) 5cm Pak 38, multi tone,
6 & 7) 7.5cm Pak 40, 3 tone camo
8 & 9)two unknown gun carriages
10) 8.8cm Flak 36 (likely) or Flak 37, looks to be all dk yellow
11) to the right, another unknown carriage (maybe 5cm Pak 38)
12) 10.5cm leFH18 haubitze, all dk yellow
13) after the leFH18, it gets sketchy -- maybe the next one is a 8.8cm Flak 41 with a folded gun shield -- I dunno. Although the multi toned 8.8cm Flak 36 or Flak 37 is visible in the far left as well. Note the T-2/M31 TRV in the far right background.
None of these pieces (each one I list was actually sent to Panzerarmee Afrika) rules out Tunisia but there is a Sicily/Italy feel to the pic. This is just a guess.