Alignment on Home Page

I love this theme and have spent a few hours trying to implement it as well as going over the support forums in depth prior to asking a question.. I know this is a CSS thing, but all my home page images are aligning to the bottom instead of stacking in and filling up the spaces to make it look as nice as the demo.. Also, because there’s somehow a difference in the padding or margins (not sure how) I am pushing what should be a 4th image on each row (as I can see in your demo) to the next row and the images aren’t centered on the page so it looks really off being left aligned…

Help please!! My website is http://www.tracylee.org.. Thank you in advance!