https://www.pastelguildofeurope.org/four-seasons-beginner-challenge/autumn-challenge 2025-12-04 https://www.pastelguildofeurope.org/four-seasons-beginner-challenge/summer-challenge 2025-12-03 https://www.pastelguildofeurope.org/four-seasons-beginner-challenge/spring-challenge 2025-12-03 https://www.pastelguildofeurope.org/four-seasons-beginner-challenge/winter-challenge 2026-02-02