I have to agree with what's already been mentioned, don't know why so many people are saying to change the theme. That an easy out reply. And not that helpful.
It's the content that could use some dressing up. Most theme's will look boring if the content is not spruced up. Not just a "change the theme" thing here. I think the theme looks nice, clean. Course I kinda of like minimal myself. Also think it tends to allow visitors to focus more on the content. Just my opinion.
I agree though, that others have said, the content could use some visuals. Thing is it doesn't always have to be images. For example, I use a plugin called Intense for most of my blogs. It gives me a bunch of shortcodes I can use in my posts to make them look nicer. Such as quote boxes, icons, tabbed content, colored boxes, colored style elements, ect. There are a bunch of plugins like that. It can make your posts look much better. Just a thought.
Even just using bold here and there, or colored text here and there could make it nicer. No?
Other thing I noticed, and maybe it's just me, but there looks to be quite a bit of big blocks of text. That's not exactly fun to read, it's like work. Even on a sub-conscious level. But that might just be my peeve
I think it looks good over all though!