PomboCZ
Very nice work, though I have some nit-picks about B-534.
Vertical stablizer looks to me bit too short (low) or too wide, landing wheel covers seems bit too "square-ish" (I'd round them a bit) and I suggest of redoing the canopy on later models - either make the frame 3-pixel wide (contour-color-contour), or only 1-pixel (contour), but not 2-pixel while the front windscreen looks bulbous, while it wasn't.
Keep it up!
Are You planning to do all pre-WW2 Czechoslovak airplanes? (Avia BH-33/PWS-A is in the works already)
What about creating separate thread for them, like the Polish Wings thread started by Rhade and me?