First you have to work on your sketching. Just get a long pencil and start sketching. Don't sketch from your imagination, sketch what is front of you. Look at your table, and just sketch whatever you see. Doesn't matter if it comes out right or wrong, as long as you're doing it, it's good. If you thinking that's boring, too bad. You have the learn to basics.
If you manage to draw good inanimate objects, time to move on to real things. Go to this site,
NSFW(This site is full of naked woman and man) And just start drawing those bodies. You might be thinking "But I only do chibi drawings, proportion doesn't really matter in my style." You'd be surprised how much it matters. Almost all the chibi artist, starts with drawing actual people. START DRAWING THEM.
Go in this order. Start by drawing faces, then go draw the bodies, after that draw the full sized people. and keep doing until you're satisfied with your work.
Just remember, There are "bad" works, but there are no "wasted" works. As long as you learn something from drawing them, you're good.
Another note, your drawing ain't bad. it just needs improvements. Just keep practicing