So much contributes to paint smoothness. Did you prep the mini well? The mold line on the top part of his sword tells me maybe not
As far as consistency, as a general rule I tend to dilute less the lighter my paint gets. So shadows are very thin, mid tones are less thin, and my highlights can be the least diluted because they tend to get chalky very easily. But I also once told someone that smooth painting is really all about pushing the paint around so that it settles evenly across a surface. It shouldn't pool anywhere, and it needs to be even when it dries. Also, no matter how thin you make your paint, you've got let let layers dry in between or you will only tear up the last layer when you add a new one, and this takes away from smoothness. Again, with diluted paint it becomes purely about pushing around the paint so that it settles evenly. This is the toughest thing for newcomers to understand. Don't let it pool, don't let it settle in cracks and crevices. It's good to often end brush strokes over edges of surfaces, otherwise you leave a big pool wherever you lift up your brush. Finally, keeping your paint even has a lot to do with keeping it barely damp with paint, which means brushing off excess fluid on a paper towel, and then testing the consistency on your thumb or hand. This is incredibly important. Follow this advice for smooth layers. This description or advice I just provided isn't explained in this way very often to new painters, so I hope that you or any other painters take this to heart as it is what I've learned through trial and error after my year of painting.
Finally, take better pics, even for WIP shots. It helps with C&C, and develops good habits overall for your gallery submissions.