Theme Spacing, Centering Issues

I’m having some issues with my theme. There is some extra space between images in posts that I do not want to be there:

https://scrawlfx.com/2008/05/dead-space-five-new-screenshots/

Also, I try to center some images from nextgengallery using <p style=”text-align: center;”> and it does not work, it is weird. If you can help me out, shoot me your AIM. Thanks!

Here is that example: https://scrawlfx.com/2008/05/the-agency-more-artworks-new-sneek-peeks-on-x-play-tonight/