I would add a camera "shake"-effect when the explosion is next to the player, this let's the player think that the explosion is really "huge".
We've also added some stone particles at the explo position (on the ceiling) so it looks like that the env. get also hit. I think this will also work just fine with "dynamite"...
You can also try to place a flickering dynamic light at the position of the dynamite-fire. If you're using a spec-bump shader for the dynamite this could look really impressive and more dynamic.