u/Sea_Preference_8647

I having some trouble with my colouring. When I want to reuse a colour I used previously its always a hassle to accurately mix it again (I only have a 12 colour Winsor and Newton set). Do you guys have any tips? I thought about buying tubes so I can mix more pigment but idk. Hope you like this painting anyway.

Trying to play with blank space a little more, hope you like this one!

I can't quite figure out if I should colour the whole bus or leave the blank space. It feels kinda empty now but I'm afraid I will lose the contrast with the background if I colour everything. Any thoughts?