Thank you all
No problem, I've made few color variations for female suit, and yellow male suit (but yellow may be not the best choice, cause LEGO uses yellow as skin color)
Female Lime 1
Female Lime 2
Female Blue 1
Female Blue 2
Male Yellow 1
Male Yellow 2
About pixelated images: It depends on what caused pixelization, curved lines can look pixelated on screen, but after printing it might not be noticeable. To reduce pixelization you’ll probably need to redraw decals. You can do this in Photoshop. Illustrator and Inkscape more suitable for vector designing but they are harder to study. Photoshop has vector tools too and allow you to combine vector and raster techniques. By the way saving as jpeg may cause some artifacts and blurry, jpeg was created for saving colorful photos, png was created for saving “non-photo” grapics.
Don't forget to hold Ctrl, or you can accidentally delete node when you wanted to move it.
The following image shows few steps of creating vector version of logo symbol from reference image: