Mystie Makes Models

[Kyalie]

You're definitely lacking vertical cuts as well: seen from the top your main shape probably looks like a diamond, since you got only four sides. Never used this program, but from what i kind see, you can probably use loop cut and slide to subdivide this part as well. To get a smooth shape, you need to have as many vertical lines as horizontal ones, so that your polygons look like squares instead of rectangles.
I hope it helps and i'm not saying too many things that might sound obvious to you