were you working with a megaman7 or a "rockman power battles/fighters" sprite as reference? it certainly reminds me of it. if you edited your robot over a RMPB/F you better say it now...
http://www.sprites-inc.co.uk/files/Classic/ I'm gonna leave a link where you can check both megaman7 and power fighters/battle so that anyone that might feel like it can and WILL compare them.
anyhow, whatever the case is you're imitating the bad things about these games way too much, rather than the good things. As has been mentioned the path of both feet is way too similar for a sidescroller sprite, but more than that your volumes are poorly defined, so there's no much to tell the right leg from the left one, oldest trick in the book is to make the back leg darker and the fore leg lighter to get it over with, but you should really work on making a better path for all of the limbs.