Makeup help UPDATE

So I've been practicing for a while, but I feel like I'm doing it all wrong. Please help me!

This sadly is the only picture I have on the simplest makeup look. How did you practice or identify a problem?

update:

Thank you so much for all the tips and compliments; I use a £1.79 blending brush which I love! I tried some other looks bearing in mind what you guys advised.

I'm a makeup addict but also an aspiring tattoo artist. I'm 16, nearly 17, not too long ago I started designing and doing henna tattoos and I already had a lot of clients. I've been dying to add some makeup services to that too, if it goes well of course. Thank you!