I made a game that's similar to https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCsQFjAA&url=http%3A%2F%2Fwww.addictinggames.com%2Faction-games%2Ftheworldshardestgame.jsp&ei=GpuOUpTeHeno2QX8w4HgDA&usg=AFQjCNH8Ls75i6caDkx0G93qgW3Dtm5ytA&bvm=bv.56988011,d.b2I.
I used other people's graphics for my game, but I want to make my own.

Am I just lacking common sense on how to make them or something? I can't even find any tutorials.

I tried to make a stickman sprite, but the stickman's head was always messed up. It looked so fake when it was moving, but in something like https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCsQFjAA&url=http%3A%2F%2Fwww.addictinggames.com%2Faction-games%2Felectricman2.jsp&ei=n5uOUsv6IsTV2QWCuIC4Ag&usg=AFQjCNForlAO6Eo1G_hzVymVP8BkPKjSdg&bvm=bv.56988011,d.b2I, the stickmen looks like it's actually walking.

If there are such tutorials, can someone link me to it please?

the fact that it's 2013 and people don't know how to properly embed nor link an image is astounding to me

What u expect? He cant even draw a stickman.