1. When making duaa one should raise his hands parallel to his chest. [1]
عن سلمان الفارسي : عن النبي صلى الله عليه و سلم قال إن الله حيي كريم يستحيي إذا رفع الرجل إليه يديه أن يردهما صفرا خائبين (ترمذي رقم 3556)
Hadhrat Salmaan Faarsi (Radhiyallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “Certainly Allah Ta’ala is the most honourable and most kind and generous. His honour is such that He feels it against His greatness and mercy to let the one who raises his hands in duaa to Him, go empty handed.
عن ابن عباس رضي الله عنه أن رسول الله قال هكذا الإخلاص يشير بأصبعه التي تلي الإبهام وهذا الدعاء فرفع يديه حذو منكبين وهذا الابتهال فرفع يديه مدا (المستدرك رقم 7903)
Hadhrat ibn Abbaas (Radhiyallahu Anhuma) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “Ikhlaas (i.e. expressing one’s belief in the oneness of Allah Ta’ala) takes place in salaah through raising the index finger (in tashahhud), and duaa (after salaah or at any other time) takes place through raising one’s hands in line with the shoulders, and ibtihaal (i.e. expressing one’s fervent supplication before Allah Ta’ala) takes place through stretching out one’s hands high in Duaa (e.g. as done in the duaa of istisqaa-seeking rain).”
2. When making duaa, one should face the palms upwards towards the sky.
عن مالك بن يسار رضي الله عنه قال قال رسول الله صلى الله عليه وسلم: إذا سألتم الله فاسألوه ببطون أكفكم ولا تسألوه بظهورها (ابو داود رقم 1488) قال أبو داود قال سليمان بن عبد الحميد له عندنا صحبة يعنى مالك بن يسار.
Hadhrat Maalik bin Yasaar (Radhiyallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “At the time of duaa when you beg Allah Ta’ala, then beg Him in the condition that you face your inner palms upwards (i.e. towards the sky). Do not face your hands downwards (i.e. towards the ground).
[1] والمستحب أن يرفع يديه عند الدعاء بحذاء صدره كذا في القنية (الفتاوى الهندية 5/318)