I'm just going to assume you're a artist who drew it. Anyway so if i look at your drawing I get no feeling of depth from it at all. The big reason is because you're drawing 2d instead of 3d. Like for instance her head is just an oval there's no feeling of a 3d form at all, this is because you're symbol drawing instead of drawing form. You've drawn contour lines all over the form but they don't actually conform to any form underneath they're mostly straight and don't wrap around the forms that are supposed to be there. Andrew loomis' fun with a pencil starts to teach you to draw with 3d forms so that's why it's always a good place to start for any beginner. I hope this helps but if it doesn't, go through some of the recommended beginners books in the pastebin they'll give you a good starting point.