@justina_SLAS The only pages that appear to be a bit different from the other pages on your site are those in the "sound" portfolio. Those pages are reached via the image links on the Sounds page (http://www.soundslikeastory.be/sounds.html). The Sounds portfolio pages appear to be using a yellow color gradient in the banner rather than a solid color with a title like you did with the Stories portfolio pages. You appear to be using the same "Header" page header type on all site pages.
If you mean that you'd rather have the Sounds portfolio pages look similar to the Stories portfolio pages, you need only modify the banner color to a solid color and either update the default title text, or, if there's no title there, drop a title element into the banner and add the portfolio category name, e.g., "Pop Choir" (note that your Pop Choir image link incorrectly opens the page in a new browser tab so you'll want to edit the link and uncheck the box to open the link in a new window).
A suggestion: you might contemplate employing blog pages for your Sounds and Stories portfolios. This approach would allow you to add portfolio items as posts to the relevant blog page (Sounds or Stories) and add indicative meta information via post Categories like "Spoken Word" or "Human Stories" or "Music Lessons." These would be high-level categories (you don't want too many so keep them relatively general) that you can apply to multiple posts. So, for example, stories about immigrant experiences under the "Stories" blog might fall into the category of "Human Stories." In a blog page, each post is presented in a diary format with a sidebar containing default category links and archive links. Clicking a category link would filter the blog page down to just the posts under that particular category, e.g., show me only posts categorized under "Pop Choir."
