Start drawing in a sketchbook right now.
Really, just do it. Your drawing level right now is underdeveloped. You can come up with the usual excuses people make, like "I don't have the talent", but what it comes down to is CORRECT PRACTICE. Open up a book and start churning out those sketches.
Your pixel art will benefit too.
We can't really comment on this, since they are just bare bone sketches that anyone could create really. There's no form, no silhouette, no definition, no line control. I'm not saying this to be hurtful, disrespectful or anything else. I'm just making it a bit blunter than usual, because I feel it's needed.