Could anyone show me how to make a better attack animation?

Could anyone show me how to make a better attack animation?

I made an attack animation as seen below however, the sword swing, seems off and it does not feel fluid could anyone show me how to make the  sword animation more fluid? sword and the character is attached also below, for some reason it just doesnt feel or look right to play with, could anyone help? Thank you for reading.

Attachments: 
Preview
attack anim spritesheet full.png attack anim spritesheet full.png 2.9 Kb [11 download(s)]
Preview
swordswingforsmear.png swordswingforsmear.png 440 b [5 download(s)]
Preview
IDLE TEdt.png IDLE TEdt.png 909 b [4 download(s)]
Preview
sword swing straight horizontal.png sword swing straight horizontal.png 20.7 Kb [3 download(s)]