Mister,
Usual caveats - I am a relative newbie on this subject, and do not claim to be definitive (for this can I recommend sources such as the excellent Lynn Ritger's 109 Lair?) Am interested in 109's, but still very definitely taking first steps.
However: Isn't the 109E in your pic one there's some very good pics of, on www.airliners.net? I think CF-EML is the bird, photographer is Mark Kryst, type is E-4 so square canopy/no visible ETC bomb rack under the pilot/open nose cone/the shorter 'normal' supercharger intake.
FWIW the 109 got heavier armour as things warmed up: http://www.hyperscale.com/reviews/accessor...4reviewbg_1.htm is a good pic showing the frontal armour. Your subject hasn't got it, if it's the one I think.
Types - to paraphrase Jerry Scutts' "Combat Legend":
The E-1 is (IIUC) earlier (rounded) canopy and machine guns in the wings.
E-1B got a bomb rack (various types) and MG-FF cannon (earlier canopy)
E-3 had heavier canopy (the square one) and MG-FF's. Some had the longer (tropical) intake, some had the rounded prop spinner.
E-4 had even heavier canopy and MG-FF/M cannon. E-4/BN got the tweaked DB601N engine. The E-4 got the ETC bomb rack as an option (for the Jabo - fighter bomber - version)
E-5 was the photo recon version with the radio (accessed via hatch, half way down the port side of the fuselage) replaced with single camera
E-6 (or at least E-6/N) was like an E-5 but 2 cameras fitted.
E-7 let the owners bolt a drop tank off the bomb rack. Various versions including the E-7/B extended range fighter bomber, E-7N same with high pressure oxygen system, E-7/Z same with DB601N and GM-1 nitrous boost.
Various factory option kits available (E-7/U* types.)
E-8 is the extended range version with a DB601A ('based on the E-1 but similar fit to the E-7')
HTH - Patrick