Loving the look of this! I'd say I don't mind which light level is best but I personally prefer the original look as it gives off the dark and creepy vibe you need, although maybe too dark to reveal the key parts of the scene. The last picture however might be too much light but it looks good regardless though! Maybe you could add triggered lighting directed onto the mummy in the centre (even if it's the same lighting used in the last picture) so it directs the riders' attention towards the mummy when it animates? Just an idea if you're looking for a dramatic effect.