The drawing’s not bad, but if you use a camera for digitizing drawings, at the very least straighten, crop and resize the photos before uploading them.
 
Cameras aren’t the best tool for this, but with some preprocessing, you can make them work. Getting even lighting is hard, because the camera itself, your hands and you often cast a shadow on the image. And if you find an angle where they don’t, then the perspective is wrong and warped, and it requires editing.