Perspective in art?

Maybe it's just me but I feel like I have some problems with conveying the sense of 3-D into my art. Even if the background is plain I don't think the character pops out enough. I feel like I have some lighting issues and am unsure of where I want light A to come from. It seems like some other people's anime art: http://naturaljuice.deviantart.com/gallery/ seems to have more dimensions than my semi realistic art: http://www.deviantart.com/art/Miku-2017-653370392 . I did one piece where it felt a little bit 3-D but not as much that's more anime like: http://www.deviantart.com/art/Secret-Santa-Kukinima-650582527 still feels like it's missing that extra dimension.

I'm not sure what I'm lacking but I want to improve on this for 2017 and see some actual improvements in my coloring and I will work more on coloring clothing ruffles and drawing hands! Maybe I just need more studies in my life.