Аннотация:The study objectives were: 1) the comparison of the actual and ideal self-image with the life satisfaction (LS) and with the self-assessment of success in professional activity and in life in general; 2)the analysis of the desirable changes in the personality traits of respondents and their co-twins. Survey sample – 136 members of female monozygotic twin pairs aged 18-46 years. The self-image as well as the desirable changes of personality traits were diagnosed by semantic differential method, LS – with the SWLS(E.Diener), a success self-assessment – using Dembo's scales on which the respondents marked their place among the other people. It was shown that there are some age-related changes of an ideal self-image, connected, first of all, with the increasing attractiveness of some negative personality characteristics. The research subjects estimate themselves as more disturbing and less attractive to people as well as less persistent and avoiding conflicts than their brothers and sisters. There were identified five generalized factors: Goodwill; Insecurity; Perseverance; Authoritativeness; Emotionality. Insecurity demonstrated the closest relationship with the life satisfaction. The greater life satisfaction corresponds as well the desire to have less Goodwill and less Perseverance. The direction of the own desirable changes and of the co-twin ones are identical, except for Authoritativeness. The respondents themselves want do not to be afraid of conflict situations, to be able to insist on their own. They would like to see their co-twin more gentle and compliant. The study confirms the hypothesis of the adaptive nature of negative personality characteristics.