Your art style is so cute! The colours in this piece come together really well too! Archie must've been sitting for a long time for his marshmallow to melt over a cute little fire, hehe
If I may suggest any improvements, the tree on the left works wonders for visual narration, but it looks like it could do with an outline like the bushes in the foreground. It's got shading like the foreground bushes but the 'linelessness' of the background trees. This is only a minor nitpick though and for someone who doesn't often do backgrounds you still made an amazing piece overall! <3