First of all welcome to hubpages! Probably the first thing to improve your hubs is write more. You have a great start, by adding a little more "meat" to them, in other words more information then you could vastly improve them!!
Another great trick that will help people be drawn to your work is by breaking up your work with subtitles, it's more pleasing to the eye. Did you know you can actually make some of your graphics right align to your text. That's a good way of making your text appear more appealing. Those would probably be two best suggestions for you!!!