I'm still a little confused as to how large you want your images here, exactly. "64x64" doesn't exactly tell us what you're going for - especially since I don't feel like your sprites are exactly adhering to the sizes I'm expecting. There are a lot of really big colour blocks that feel wrong for the image sizes you're uploading.
I feel like your ogre sprite, in particular, has too many colours and not enough contrast. It all feels really blurry and indistinct, with everything merging into everything else.
Everything about this just confuses my eyes and isn't what I feel like I would expect.
Here's a really quick edit I did. This ogre is designed for a space 64 pixels wide and 128 tall (1x2 tiles).
To contrast, here is your ogre in this same space.
See how it feels like it's a much lower resolution? You're not properly utilizing the space you have. The sizing is just all kinds of funky. You can also take a look at mine to see how a smaller colour palette with colours that are used in less blurry ways giving a better feeling of depth and detail to an image.