I think you have some problems going on with your basesprite.
If you place it next to a correctly shaped 3/4 viewed box it appears flat.
Your character looks like it's viewed from "base height" like in a sidescroller, but those projections are seen from above
I quickly edited 2 frame sof your char, that it better fits in the chosen projection.
-be careful with the top of the head which should be visible more
-curves like the circlet or the bottom of the dress recede in space.
for the "iso" projection:
-make sure that arms and feet follow the 2:1 line.
-also the top of the head should be more visible.
basically the same problems are evident in all 8 directions.
Try to understand how basic forms in this projection look like.
Try to build up your character in a "virtual" space.