Though I haven't watched Rotgrind, seeing fan art like this for such tabletop web series projects is quite incredible. Fwoly *huck*, a lot of time must have gone into the shine for the edges of those bricks, both on the roadside and on the balustrateds on the bridge above. Same for all the softer shadowing under the characters, the grime on the walls and chairs and gutter, and the generally painterly feel.
From a random person on the internet, you more than deserve to be proud of this, and I hope that if the Narrative Declaration crew has seen it, that it's made their day.
