Art is subjective. The only one who can say if it's "good" or not is the artist themselves. I can point out technical flaws, etc, but my opinion doesn't make the art good or bad. If the artist is satisfied, if the art accurately represents the vision they had for it, then it is perfect regardless of popular opinion.

That said, I want advice regarding technical flaws - like Rad's tip about the lines. Anyone is qualified to criticize it regardless of how skilled they think they are. You don't need to know acrylics from oils to have a valid opinion. So, criticize away, DD. I want to hear it because I'm not really satisfied, therefore my art is not perfect.