[DustyPorViva]

Are these pixel art? They seem like you tried to pixel these. Anyways, as for technique... the AA on the heart is messy, and looks like you just blurred the image or something. And the dithering on the monitor is just messy. There are stray pixels everywhere that don't really contribute to the image in any way. Also, you should try using these sets of lines(attached) as often as possible. It looks like you were trying to make the monitor isometric, and in that case it would be a 2:1 pixel ratio line.