Welcome to Nameberry! I really like your list! I’ll give you my thoughts on each name, plus some additional suggestions they remind me of in sound and/or style!
Amelia–Beautiful, flowing, lively name with a plethora of nicknames (Amy, Mellie, Millie, Melia, Lia, Mia, etc.). Amelia Jean is a delightful combo. This name is very popular (at least in the U.S., I’m not sure about other places). I don’t think it will ever feel trendy, though, because it’s just a lovely classic. Amelia reminds me of:
Reese–This one strikes me as distinct from your other choices. It feels sleek, modern, and unisex. Reese Elizabeth or Reese Catherine would make a nice balanced pairing. I also think Reese would make a great middle–Amelia Reese, maybe? Reese reminds me of:
Jane (Janie)–Ooh, I love this one. Jane is one of those names that’s classic and completely familiar, but so underused. I would love to meet a little Janie. I personally would prefer this one with a slightly more adventurous middle, but Jane Elizabeth or Jane Catherine are undoubtedly lovely. Jane reminds me of:
Emma–Sweet, energetic, and an all around great name, but very popular. That said, if it’s your favorite, the popularity really doesn’t matter all that much. Emma Jean would be a very sweet first-middle pair. Emma reminds me of: