Hello
Your pictures are a bit on the large size. I tested the ones on the left and I guess you used the handles to adjust them to the desired size. This is OK but it doesn't take the weight out of the pictures.
What is probably best is to resize pictures outside of BV builder, save them as a gif or jpeg and reinsert them.
I personally use snaggit, but there are loads of picture resizers out there if you do a google search.
If you want to take a look at snaggit you can find it here
http://www.dcwebsolutions.co.uk/usefullinks.html
Darren