Ok, it seems that you use a out of the box theme and made no changes.
Problems:
1. You have no menu. (Or i was unable to find it.)
2. You need a good looking image banner.
3. Not a must, but i think a logo will help and give a more professional look to your blog. (it works with text to, but something that can be integrated good in the banner)
4. Just from the home page i seen 8 font colors used in your articles. It is very confusing and looks bad. If you want to highlight some parts of text use bold, or a slightly variation of the usual font color.
It is a shame, the theme is holding you back, because I can see you put a lot of work in your articles. It can be a really good looking blog if you work on the looks a little.
I think that if you looked a little more you could find a better theme. Maybe take a look at the site5 free wordpress themes. They have some good looking theme with sliders, and are really easy to configure. They can be used out of the box. http://www.site5.com/wordpress-themes/
Check out the previews and see if you like something.
You need a better theme, this one has a lot of problems… the sidebar on the homepage is absent, the background is dark and does not looks good. Too many reasons really to get a different theme…
apart from that, i would suggest you to keep the text color to black and stick with it. The green/orange/gray combination is a bit unfriendly to the eyes.
keep the blog updated,
cheers,
