These layout suggestion and layout re-do's were done as a part of Course 1, Lesson 8A, on Visual Weight. I invite you to be brave and participate by senidng me a layout. It is how I learned to grow in skills, with others giving me suggestions.
1. contrast - I do not see any contrast problems. The photos pop and the text is readable.
2. size - The size of the photos is the design principle that is working well in this photo to make the eyes go to the largest photo first.
3. color - The brightness of the girl's shirts in the large photo are also pulling visual weight, but since its the photo, that's a good thing. However, the white graph paper is the only white on the page and it is also very bright. My eye is going to the white paper second and getting stuck there, not wanting to move anywhere else on the page. I see this as the main problem with your layout. You can fix it in two ways - either use the "rule of thirds" to put white in three places or change it so its not white.
4. shape - The cute heart-shaped element is drawing some visual weight, but since it is so much smaller than the photos, you are doing okay with it. If you do make the photos smaller though in a re-do, you would have to make that element smaller to keep the visual weight down.
5. texture - As the other ladies mentioned above, the patterns in this layout are considered "texture" and make for a very busy layout. Overall, I don't think the patterns in the papers are that distracting (see the next lesson), but the stuff in the background of the photo is distracting. I would suggest, if you have the skills, making the background of the photo black and white (color isolation tutorial in course 2).
6. isolation - you have nothing isolated in this layout. Included in isolation is "white space" which is valuable in a layout. By making some of the things a tad smaller and leaving some white space, I think it would help your layout dramatically, including not having the lines on the white paper (making it a solid color) as that alone would create white space.
7. value - the cute heart would have a play on visual weight, as indicated above.
8. balance - balance is okay, but its only because every space if filled. Will balance be okay if you add white space?