i think venus in the 12th would be a weak position for a composite chart because it is a cadent house .
Planets in the 12th are considered to be undevelopd or lacking something in terms of karma.
The love you have for one another may be secret or private, and/or you are called upon to take a leap of faith in order to be with one another. Much of the time, putting faith in one another brings you joy. However, humans are imperfect, and complete faith is hard to keep up all of the time. Herein lies the main challenge of this position. Being in a position where there is mystery or confusion surrounding your partner and/or your relationship can be trying over time. It can be hard to feel clear about the direction of your partnership, and there is a resistance to such clarity. Uncertainty, or a feeling of inequality between the two of you (such as a large age difference, an affair, and so forth), are themes of your relationship. Do your best not to make so many sacrifices for one another that you end up ignoring your own needs for happiness. -Cafe Astrology
you have a lot of planets in the 1st house which is good
There are not a lot of aspects between the planets though
also i know in a natal chart any planet in the 29th degree is considered to be the weakest point , but I don't know if the degree of a planet has an effect on a composite chart? If a more experienced astrologer could maybe let me know....because the moon and jupiter are in the 29th degree.
hope this helps a little, best of luck