Thumb image not showing on Recent Posts Widget

Hi, I just realized I posted this question in a different template, so here you go:

I uploaded the demo file and have been working on it, but the thumb images don’t show on Recent Post Widgets. I already upload the “Regenerate Thumb Images” plugin.

Any idea on why is this happening?
Here is the link: http://www.babywhisp.com/blog/

Thank you!

Isadora