Fire is bright and tends to leave lots of light on surface joints. Lets add some additional light to the window frames and trim pieces. Make a new blank layer below the fire layer, but above any structure layers. Set the new layer to "screen" mode. Using the line tool with a pale yellow color at low opacity, draw in highlights. Build up successive lines to increase the brightness/thickness for details that are close to the fire. Below is my rendition as applied to the image. Note: I took the liberty of turning out the lights in the leftmost room since it is not yet on fire.