So, I love all three of the GBA games equally. I don´t think I have a favourite but what I do know is that I prefer Fe8´s portraits by far. They are clean, crisp and they don´t have washed out colours like in fe6 and 7.
So I decided to redo fe7-6 portraits in fe8 style. I wanted to keep true to the original design of the characters so there are no crazy colours here. I also wanted to use fe8 colours as they come (for the most part), I only adjusted them whenever a fe7-6 colour was too unique and couldn´t find a fe8 counterpart.
At the moment I only redid fe7 main characters. If people like it maybe I can make a patch to insert the sprites in-game but I don´t know anything about hacking yet so it make take awhile.
Feel free to point out any inconsistencies. Also, I´m not entirely settled on skin colours.
UPDATE: I changed my mind and decided on Fe6 first! The Fe7 mugs in the comments are outdated.
Here´s what´s currently done,