1. One should keep a slight gap between both the palms. [1]
2. When making duaa, one should express his total inability and weakness and beg Allah Ta’ala in a soft tone with complete humility.
ادْعُوا رَبَّكُمْ تَضَرُّعًا وَخُفْيَةً إِنَّهُ لَا يُحِبُّ الْمُعْتَدِينَ ﴿الأعراف: ٥٥﴾
Call on your Lord with humility and softly: for Allah does not love those who trespass beyond bounds.
وَاذْكُر رَّبَّكَ فِي نَفْسِكَ تَضَرُّعًا وَخِيفَةً وَدُونَ الْجَهْرِ مِنَ الْقَوْلِ بِالْغُدُوِّ وَالْآصَالِ وَلَا تَكُن مِّنَ الْغَافِلِينَ ﴿الأعراف: ٢٠٥﴾
And call upon your Lord within yourself in humility and in fear without raising one’s voice in the mornings and the evenings. And do not be among the heedless.
[1] والأفضل في الدعاء أن يبسط كفيه ويكون بينهما فرجة (الفتاوى الهندية 5/318)