I have been drawing with my tablet for the last 5 or so years (and doodling pretty much most of my young life) so I'll tell you something that I think every newby artist should know and what I wish was told to me.
Dont go straight into drawing anime, I know it's tempting and it even seems easier but honestly it is a lot harder to be good at drawing nicely stylized anime compared to straight from life drawings. Draw real people, do gesture drawing, set up a still life and draw that, learn the fundamentals of shading and form. The more you draw from life the more life you can put in your pictures. Once you have a grasp on anatomy, lighting and perspective then you should get into drawing anime.
The main reasons I think this is important is because if you start off drawing from your imagination with no reference to real life you start to form bad habits, like collar bones that are way to high and spines that are twisted out of shape. Secondly anime is a stylization of real life, if you don't have a good understanding of how real people are drawn it is very difficult to create an appealing anime style because more often than not you have no idea what the proportions or shapes of the body should look like and how to stylize them.
www.youtube.com/watch?v=iBadnTAzQFc watch this video, although its technically an "eye" tutorial the guy also talks a little about what i just mentioned about stylization and learning to draw realism first. Then when your done, watch a ton more tutorials on "how to draw" and draw a bunch of things, and avoid "how to draw anime" until you think you've grasped the basics.
oh god i sound pretentious as hell my apologies for that but regardless, ^ do that, it will help in the long run.
Also as for the picture you made, the wrists look like they were broken, I'm not sure if that was what you were trying to portray but if not, its a good way to show you why drawing from real life will help you improve. You need learn how to: Foreshorten, familiarize yourself with anatomy, look at references for chairs so that your's don't look like blocks glued to blocks and proportions.
so instead of having the hand melt over the handle try to make the fingers wrap around the edge like a normal person would handle an armrest like this
i.imgur.com/mmemCFM.png