Dedmond29 covered a lot of important things. Google will only list links coming to your site if the site linking to you has a page rank of 4 or above. However, that doesn't mean that Google will not give you credit for links coming from site with a lesser PR. Google will simply not list those, but you still get some credit for them.
Also, your links seem to be fine. There might be some things you can do to help them out, but none of those things are going to have any significant effect on your rankings. The higher your PR, the more pages of your site Google will index. You might also have to wait a bit for Google to do a deep crawl if it hasn't done so yet.
Hope that helps a bit.
