I think you need to google some more reference images and possible use a good reference image to model from. Just create a plane, and place the image as a material on it and it works good.
That's not bad for being self-taught. But you need to cut on polys if you want to stay low-poly. I made an image paint-over to give you some crits. Also, if you don't know already, games typically only accept 3-sided polygons (triangles) and 4-sided polygons (quads), so make sure you have no polygons on your model that has…