Does this design reflect a(n)...
• well developed and easily understood concept?
Your conceptual solution clearly communicates the massage that you intend to convey. I do however think that you can make it even more powerful by exploring alternative visual and media solutions. For instance, instead of writing your text message with a coloured pencil on paper, it might be more powerful to write it with a stick in soil or with a finger in dust. I also suggest that you review your use of language which is currently quite sophisticated. Consider something like “I wish that I was allowed to go back to school.”
• level of social engagement?
Good. See above comments to make it even more powerful.
• understanding of the issues reflected in the poster?
• sense of internationalism and accessibility?
Good. Also consider producing the poster in more than one language.