GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User

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Hi!

I've recently switched from painting with PhotoShop to GIMP. I've been trying to apply the same techniques in GIMP but I've bumped into one issue. When I paint with a low opacitiy, a dark colour comes of really strong on top of a light colour but the same light colour barely shows up on the same dark colour with the same opacity. It's really slowing down my process for blending colours, I wish that a no matter if I'm painting dark over light or light over dark I want it to show up in the same way with the same, low (30-ish) opacity. I don't know if I have the wrong brush settings, I'm really new to this. But I hope someone understands my problem and can help!

Have you tried painting the colors you want with 100% opacity, blending them and then lowering the opacity?

What I've been attempting to do is to paint a base colour, and then paint a darker colour, and then blending those by lowering the opacity and trying to use the colour picker to find middle-tones and blend them together with a low opacity brush. It's hard to explain in text how I do, but the result that I get is a cel-shaded look with a few colours rather than evenly blended colours.

Yeah, it really difficult to explain. Plus I'm not much of a Gimp Painter anyway. Just thought I'd throw one out there.
There are other's here that do really great Gimp paintings. Hopefully one of them will have some better suggestions for you.

Hi Bewwen, I use the smudge tool to blend colors at any opacity level.