For these sprites, unless these are just frames in the middle of a walk animation, should probably have both feet being level. As of right now, the sprite simply looks disproportionate. Also, when doing pixel art, it is never a good idea to save it as a .JPG file type, I would recommend .PNG or .GIF. To change file type, while saving there is usually a scroll bar to change file type, simply scroll down until you find the correct type, and save it as that.
