Some graphical flaws are due to having to apply effects to a different level for the pieces to match more or less (head and body for example), which worked best on one type of piece than on another (example: the head and neck have an awful separation line visible, and the tint couldn't be exactly the same, and triggered some "dry blood stains" effect on the neck). Unless this Trunks has been involved in a fight during his walk in town, the "dry blood stains" might be hard to explain, especially since he seems in a relaxed mood and doesn't seem hurt, so it's likely the blood of someone else which was spilled a bit on his neck, that would mean he's been casually kickin' some ass on his way...
Some other flaws are only due to the fact that I lacked patience for what was essentially just a "test" and rushed to the finish, not bothering to cut around the character correctly for example, hence a very obvious lack of external lines on the right cheek or left sleeve for example, or very angular hair.
Now the question is: is this Alternative Trunks or GT Trunks? (regardless of the fact that Keikuro's original face lineart was for GT Trunks)
As far as I'm concerned, I see him more as GT Trunks, both for the more casual and "relax/regular teenager style" clothes AND for the fact that the size of his head compared to his body would make him smaller, more likely GT-sized instead of adult size.
However, some things like the blue vest are reminiscent of the Alternative Trunks. Regardless of the timelines and his past life, some preferences don't change for Trunks.
So in the end, it's kind of a mix between his two incarnations, his GT version showing signs of his Alternative self as he grows up.