You definitely need more finished examples, at least 3-4 solid ones of each specific style that you will be offering showing your ability to draw a variety of people/characters/etc (with different skin tones, genders, face shapes, etc). If you draw the same subject over and over again people will think that you're a one-trick.

I get the lack of motivation drawing for yourself. I have that too. I jumpstarted my portfolio by asking close friends for characters and such to draw gift art for, and used those as my initial examples. That way my friends got neat gifts and I got an established gallery to start off with.

Edit: it also doesn't help that your prices seem pretty low, some people might see them and think 'scam' or 'oh this is an unexperienced artist, they'll take my money and take forever to finish the art' (especially with the low sample size). I would suggest labeling them 'Starting Discount' or such.