Not the mixing but the quality of song? Strange change of tempo? Crazy. Doesn't sound good at all.
Drums are not precise...
Vocal demands and yells for auto tune and melodyne.
Something is really off.
As far as the mixing goes, keep an eye on things like details, speaking about things like levels, keeping the vocal in the mix, low end pile up, wider sound picture..
All in all mix is not bad, but the recorded material is hard to listen to.
Chose songs more carefully.