The Challenge: Identify vignettes on Mozambique's notes

Today’s challenge is to identify the following vignettes from Mozambique's banknotes.

If you can precisely identify the proper name of any of the following—or have a lead which you think might be useful—please send me an email, preferably including a URL which links to evidence supporting your identification.

The following scene appears on the front of Mozambique's 100-metical note (P126) dated 16 de JUNHO DE 1980. Mozambique_BDM_100_M_1980.06.16_B11a_P126_AB_7305625_f
IDENTIFIED: Five FRELIMO soldiers raising flag on 25 June 1975 at Machava stadium in Lourenço Marques (Maputo).
Courtesy of Martin Maillot.

The following two scenes appear on the front of Mozambique's 500-metical note (P127) dated 16 de JUNHO DE 1980, so they may be related. The bottom scene could be a crowd waving their voter ID cards. However, I don't like to publish guesses in The Banknote Book, so if anyone can properly identify this vignette, please do.
Mozambique_BDM_500_M_1980.06.16_B12a_P127_AA_3009222_left
IDENTIFIED: Permanent Commission seated behind Samora Moisés Machel addressing People's Assembly.
Courtesy of David Blair.

Mozambique_BDM_500_M_1980.06.16_B12a_P127_AA_3009222_right

The following scene appears on the front of Mozambique's 1,000-metical note (P128) dated 16 de JUNHO DE 1980. On the wall is inscribed FRELIMO [Frente de Libertação de Moçambique] PARTIDO DE VANGUARDA DA REVOLUÇÃO SOCIALISTA, so it appears to be a monument or memorial to liberation fighters, but I've been unable to find its official name or location.
Mozambique_BDM_1000_M_1980.06.16_B13a_P128_AA_0004581_f

The following scene appears on the front of Mozambique's 5,000-metical note (P133) dated 3 de FEVEREIRO DE 1988 and the 500-metical note (P134) dated 16 de JUNHO DE 1991. Is the statue/carving a famous one? If so, by whom, and what is the name?
Mozambique_BDM_5000_M_1988.02.03_B18a_P133a_ZA_0013097_f

The following scene appears on the front of Mozambique's 20,000-metical note (P140) dated 16 DE JUNHO DE 1999.
Mozambique_BDM_20000_M_1999.06.16_B23a_P140_AA_6767546_f
IDENTIFIED: Allegorical representation of education.
Coutesy of Frank van Tiel.

The following appears on the back of Mozambique's 50,000-metical note (P138) dated 16 DE JUNHO DE 1993. Is this just decorative artwork, or does it have some other significance?
Mozambique_BDM_50000_M_1993.06.16_B24a_P138_EC_7631113_r