Hi @simonaburlacu,
I think it’s a great piece for your portfolio.
The storytelling feels like adventure, but the girl seems scared whereas the polar bear is happy. Personally, I would make them both happy and excited to explore rather than mix up the emotions.
The composition looks nice, though I completely missed the polar bear in the thumbnail double page spread. Maybe contrast with dark grey rock behind the polar bear to provide strong silhouette will make it pop?
The rendering and colors are really nice, magical even.
For text, I see a spot in the top left spread, but can’t say it’s enough without knowing how much text you need there.
Look forward to seeing more!