In your challenge page you should add several more paragraphs explaining your opening sentence. Basically expand in detail what you already have.
In the who we are page you might expand on what the individual specialists do and are. In the same page back up your third paragraph with reasons and examples.
You might want to include some scientific abstracts by occupational psychologists, with permission of course.
On your services page you need several detailed paragraphs explaining each service. Same thing on your uses of psychology page.
All the above would be relevant content. Once you have fleshed out your content, look for other sites that are similar to yours and might offer ancillary information. See if they would want to exchange links. If so how you use the links and how they use the links is very important. Try and use the links inside your text, as part of a paragraph. So the links flow with the text.
Also you are using images for some of your headers. I would used header tags, <h1>, instead. That will help. Add an alt tag to your images. Include some keywords, but don't go overboard with them.
In all your pages you need to define the call to action. What do you want the reader to do? What do you want them to understand? Why should they read your content, and why should they use your service? A strong call to action is a big big plus.
mike
