If you take a closer look at the original Stimpaks, the needles were super thin (hypodermic). Needles for Stimpak and Super Stimpak. Stimpak = handheld, Super Stimpak = body fixed version.
Most of these Stimpak remind me of Injectors made soley for Super sized Super Mutants ... would be interesting to cut and instead use some more pseudo IRL needle logic like min to max Hypodermic needle. The early Fo1 and Fo2 needles were probably resized (bigger) in order to even be visible. Since less than 1 px in comparison to the small model would be hard to view at all ... hence (i assume) the upscaled needles...
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If you take a closer look at the original Stimpaks, the needles were super thin (hypodermic). Needles for Stimpak and Super Stimpak.
Stimpak = handheld, Super Stimpak = body fixed version.
Anyway the image looks great.
Addendum: Maybe add a "green" variant too? :)