Hello brother, I see it's your first time making heads and stuff. I also see that you're using your fingers to draw on your iPad. It's pretty decent for the first time since it doesn't have any complexity, but if you want to get better I would like to give you some tips.
Note: This will help you improve things you are missing.
The first thing I must say if you want to get better is to get a Stylus(pen for drawing on tablets). There are tons of diferent types of Stylus, each with it's own unique functionality. This will help get cleaner details, outlines + more control on what you want to draw.
Second thing: you should buy an application called Autodesk Graphic. This app has a lot of functions for any style you want to draw, honestly one of the best drawing apps on App store.
Third thing: Your mapping of the head isn't good. If you want to get better at it there are various templates on google. Just search "Toribash head template" and you will find images that will support you at making the head.
Fourth: (Optional) Start doing sketches and add some shading.... Sketches are your best friends when doing graphic art, it will help you for you final product. Shading will be another important factor if you want to deliver higher quality art, you can find really good videos on youtube that will teach you how to shade correctly.
Hope this tips help you a bit. Enjoy the rest of your day/night!
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