I second what henu is saying. Venus is MUCH more suitable for something like this in terms of cosmetics and beauty. Correct me if i'm wrong, but as far as i am concerned, especially in women, mars can actually diminish beauty and femininity especially when afflicted AND prominently placed.
On a side note, from my own experience, if your midheaven is in aries, capricorn or taurus especially, and you work with your hands for a living, just be on the safe side and do not chant the mantra of mars outside of an official mars square with a purpose, unless you are trying to use it to empower your sacral chakra with affirmations. I did this to try to amplify positive outcomes for work production in general, and both times, within either a few hours or a day later i got burned while i was welding or from the torch while doing deconstruction.
Being also as all your placements are connected to one another somehow, planetary mantras and squares CAN (but don't always have to, it depends on the individual) amplify both good and bad, which makes deep cleaning before trying to attract something essential. Mars specifically is the lesser malefic, and the mantra thereof, along with the rest of the planets for that matter are better off not tampered with lightly unless you are significantly aware of how this affects the rest of the things in your chart depending on what you have cleaned or sublimated.
I mentioned this in the past, but when i did mars squares, it amplified my air, and got me good relations with coworkers and work in general. The affirmation specifically was set to have my natal mars only manifest in good ways. As a result of the house it was in and other things, it also attracted certain sexual/romantic prospects that i was not interested in, who also had mars in that same house, yet these people also were the types the not so great parts of my Neptune and Venus attract for the worse.
This shows that the energies will manifest in ways that are the easiest, since energy takes the path of least resistance anyway, and what there is the greatest predisposition towards as a whole in relation to your chart.
in terms of mars manifesting in the aforementioned ways positively, it did, as exchanges were friendly and kind and i was even able to help these people. The part of my chart connected to these things however, still had problems of its own, not necessarily having to do with my mars directly but indirectly connected to it, as mars also rules sexual relations which is connected to attracting also romance and intimacy, the things my other planets are connected to.