Nail Artist As Profession
There is nothing innately objectionable in your profession . You are not doing a Haram act and neither are you doing it for immoral/unethical purposes. From the point of view of the wearer , fake nails can only become a matter of concern when they are used for something immoral/unethical , like in this context for cheating/deception etc. which I doubt such nails are ever used. Besides, such nails with designs are easily identifiable, hence ruling out any aspect of cheating/deception as well. Please see for details : Discussion 85192