I approve this shipping in pony-pony form. Otherwice I would love to see Flash Sentry to return in Season 4, but considering how boring he (or actually just his human counterpart) was in the movie I don`t think there`s any change for him to be as convincing character as I, and some other brony folks, would wish him to be like. Thus his return would be in an uncanny valley and cause unnecesserily much butthurt in this fandom that is probably still recovering from the the movie (although there are people hating it more than they should).
Let it also be noted that I don`t see what a meaningful purpose would Twilight having a romantical relationship with this (or any other) colt (for that matter) would serve for the show and how would it be any necessery or needed. As Rarity would say, out of all things that could happen that would be the worst possible thing and the fact the timing for doing this would be absolutely terrible isn`t really helping here. Well, at least if it was done right away for the beginning of Season 4, but having several episodes before bringing this guy back, and then suddenly giving him this really important role as the romantical interest of the mane character would feel a really off.
Technically artwork looks really good and its good to see something new from You. But personally I do not support/like that shipping and Twilight as alicorn. In my opinion this too "candy" and made (by Hasbro) only for promotion new toys (and money). And for me (very personal opinion) Twilight as alicorn lost many of her "magic" and uniqueness. BTW great work on it.