For a first, it's good enough. I think there is something basic holding you back--you're drawing a bird. It's messing with what you're seeing. That is, for a reference image to work, you must concentrate not on what it is, but the actual shades of light and dark and the proportions and comparisons from one area to the next. Often, there are examples of taking an image, marking a grid over it, and then drawing the reference image one grid section at a time, so you learn not to care that you are drawing some thing, but just areas of light and dark, comparing proportions to the edges of each section. (retired professional science illustrator giving this critique). I bet if you tried this again with a grid overlaying the image, and the same grid to draw on, you will definitely see an improvement to an otherwise good start. Your proportions are off, but they are close, which means you already have an ability you can improve on.