I like the bumble frigate!
The quest to git gud continues. Slowly.
There are almost infinite mistakes here, most of them related to proportion, so whilst pointing those out is appreciated I'd rather have criticism on other features. :v
To be honest your proportion is not too terrible, since the face is four nose-lengths high and five eye-widths wide ( thats the average I've noticed, you can play around and adjust to make a face look different). But, there are other problems that make the portrait look ehh, the first onei s using black to define your shadows. Stop using black/gray for the shadows, as what you are indicating is that face is near only one direct powerful local light source, at night next to a lamp. But, if he's outside, the face rarely has pure black shadows rather they are much lighter because there is reflected light bouncing off and the sun isn't directly next to you. Basically shrink your value range, do not use pure black as the shadows, rather use a slightly darker color for the skin color.
Basically above is my method that I learned for finding the correct range of values, it's more of a guideline then a rule that needs to be followed always. I've found that limiting your value range helps a lot with drawing faces.
Another thing I noticed is that your form of the face, in particular the eyes and ears are poor. Overall the shape of the eyes are ok, they don't look too far off from normal eyes, it's just the symmetry that's bugging me. Since I myself struggle with symmetry, one piece of advise that's common (that I know) is to try to flip your canvas horizontally if you don't notice any symmetry errors off the bat, and be more aware the need to draw symmetric facial features. As for the ears, the problem their is just not indicating the inter forms of the ear.
Below is just some things I found that might be helpful plus a bit on how I construction faces.
The last thing is that I feel that you may be jumping too far trying to paint faces while you don't know enough art fundamentals. I suggest, instead of trying to make colored paintings of faces, to draw or paint in grayscale. Learn form/construction, perspective, anatomy, gesture, composition, values and color theory and then try to paint faces in color. Art fundamentals are vitally important to making good drawings/paintings because they are kind of tools to constructing realistic looking pieces of art, and learning them is more productive then trying to force your way to good art through repetition ( though practice is still critical too). Sycra and Ctrl+ paint are good sources of how to improve fundamentals, and they both offer good advise for free.
Hopefully this helps, I have to say that I too have a lot to learn, especially about fundamentals, and just keep on learning/drawing :> we'll all get better overtime.