I think you need to practise more on both perspective and proportion, the last one is just wrong
Perhaps learning a few image manipulating software skills would help a lot.
I also don't see any particular deep meaning or essence in your work, which could balance your weak skills.
Just keep practising.
These all artworks are not so bad but You need to improve more art skills so that people love to watch your artwork and try to show some thing different.If you need any help of mine,please feel free to ask me.May be i can help you somewhere as m also an artist.
I think that it is wonderful that you found something that you love and an outlet to express your creativity! I can only draw stick figures. These are great!