Texture painting

Ok im trying to texture paint my terrain , now i dont have any problems getting it to work, but because my island is quite big when i paint , the quality sucks it looks ok from distances , but when i walk around with my character it goes all pixalated ive tried clone painting it , ive changed the resolution , ive made the uv’s bigger , now im at a loss any help would b appreciated

If the island is too big maybe you should separate it into peaces, but then again, how about using tiled images or this: