Hey there, welcome to FFH.
First of all, your sprite for the most part looks okay but there are some small issues I'd like to point out. First of all, your palette will be an issue once you import it ingame, part of making sprites for FFT is getting them to match which isn't easy. But changing the palette so it matches is a good step in making them fit. So grab some colours from existing sprites (not ones from the forums, those already in the in the .iso file) and hopefully that will help. Keep in mind that the darkest colour/the black should pretty much always be either #282820 or #282828 (or RGB values of 40/40/32 & 40/40/40 respectively) although very rarely these values can be slightly different depending on the sprite.
I've also noticed that the sprite's head on the front diagonal view is slightly misaligned which is making him look up slightly. One of the easiest ways to check if a sprite is correctly aligned is using the arms/hands. So I quickly made this to show you what I mean:
I used the small colour for the eye, and the black dot that is noticeable on most FFT sprite hands to determine the correct positioning. Your head was 8pixels and 14pixels away from the black dot whereas the original cloud sprite was 7 and 12px. After doing this though, its made the sprite look slightly weird, like it's head doesn't sit right or the angle is a bit off! That's why its so important to start with the correct positioning as you begin
pixelling, especially if you are doing something very custom like you are.
Other than those things though, the rest is pretty good! You made some good choices for the bases of the sprite, well done!
The portrait is indeed mine, but I am slightly confused about some of the edits you made to it. Some of the edits and colours are a bit strange, particularly the saturated red and the slightly separated skin tones sometimes. From what I'm guessing, the edits seem like they were intended for use with multiple palettes. However, you should focus on one palette for Basch in my opinion.
Anyway, I hope this helped somewhat. I may have come across too harsh maybe, but it's necessary and important to get the basics right!