2 German student pilots

Before assembly, check the fit and remove the release agent with isopropyl alcohol or acetone. Cut off sprues with a saw/cutter. Wear a dust mask or respiratory mask when machining to avoid inhaling dust particles.

Carefully heat warped parts (e.g. with a hairdryer) and bend them into shape. Glue with 2K or superglue. Unpainted cast parts darken over time and can turn yellow - especially when exposed to UV light.

Pilot with leather helmet
Crash helmet (possibly obtained privately): Leather, various shades of brown or black possible
Overjacket M 1916: field gray moleskin (cotton)
Field trousers M 1910: field gray with ponceau red piping (side seam)
alternatively field trousers M 1915: gray cloth without piping (side seam)
Lace-up shoes and gaiters: brown leather (blackened from autumn 1915).
Gloves: Brown or black leather lined with fur
Scarf: evidently often civilian production; grey, field grey/dark green or other muted colours, patterns also possible (horizontal and vertical stripes)

Pilot with peaked cap
Color scheme: see above
Field cap with peak: field grey; trim strips black; ponceaured piping; peak and chin straps black leather; State cockade (e.g. Prussia - black/white/black), over it German cockade (black/white/red)
Crash helmet M 1913: mostly black or field gray lacquered leather, multi-colored variants can also occur. E.g. white body with black bulges