Great job.... I`m sure this will inspire/reassure potential wearers as to what`s possible..also, not to give up if things don`t go to expectations at the first attempt. When colouring system-hair, a softly softly approach is critical... apply colouring product for a max. of 5 minutes or so, rinse it out, dry it and see how it looks...if it needs a deeper shade, re-apply it, and again, only for a few minutes.....to achieve the same depth of colour on growing hair, you`d need to leave it in for 15-20 minutes, but system- hair grabs colour VERY fast.
You must be well-pleased with your efforts...well done.
Also, if you happen to go too deep by mistake, if you apply undiluted Creme Peroxide to the hair, it will lighten the shade again, but the best approach is as outlined above.