Dear Will,
Thank you so much for your review - I'm so glad you achieve such a good colour from the dye!
It's true the smell of Henna is very 'earthy' - this is because there's no fragrance or perfrume added, it is just the pure Henna powder. As advised, some essential oils, like Ylang Ylang, Mint, or Lavender, can be really helpful in 'masking' the smell.
You might also find that using a conditioner when rinsing, like the Logona Colour Fix Conditioner, helps afterwards as this has some fragrance and essential oils in and will aid longevity of the colour.
With Kindest Regards
Rebecca