Great work there;
For albanians, they had too light archers(in "figurines" armies you could find around internet, 3 units are represented: hussards, infantrymen(similar to hussards but carrying larger shields-rectangular) and archers those ones
I don't think better sources exist about them.
Also, I'm not expert about albanians, though, I doubt their spearmen would looks "byzantinised" as you depicted them. Figurines armies depict Albanians Spearmen with the same clothes than Hussards and these light archers.
From "war gaming something 1350 to 1500 eastern europa...blabla"...U can see these archers behind the escuade of cavalry: