The bottom horse looks like a strict Tobiano. However the belly spot could be an indicator of Splash or frame and because Tobiano does not
cause face white it's entirely possible they carry another paint gene ( sabino being most common for face white, splash, or frame overo being a possibility )
Your mare looks like a minimal splash or minimal frame overo. Have her genetically tested and don't breed her to another paint unless you know for sure 100% that the breeding will not cause an OO foal to be conceived.