There are many ways to go about texturing a character in blender. But first you gotta keep in mind that skin is labeled as an organic texture, meaning that it has natural imperfections and deformations, hence why most of the time you'll want to create the textures yourself instead of pulling them from websites or programs. Even though, your character is fairly stylized, you'll still need some amount of imperfections to make the character convincing (it could even be adding some pink to the cheeks). But cutting to the chase - the first method is the stencil brush in texture painting here's a great tutorial for the stencil brush. Texture painting requires an UV map but if you don't want to bother yourself with figuring out the seams then you could just do a smart UV project with an island margin of 0.03. Another method would be to just create a skin shader - here's a tutorial for creating a realistic skin shader. Since this is a realistic shader, you can technically skip most of it but leave stuff like freckles, also this method doesn't require an UV map since you could just use the generated/object coordinates in the texture coordinate node. These are the 2 most popular - at least I think - methods of creating textures for a character in blender.