Heyy Evvie,unfortunately I'd agree with the others for now but I think you have potencial for the future! Just keep it up, you can do it! Ganbatte

-and pls check out viorie's speedpaints on yt if you wanna expand with headshot paintings, I'd switch to 1layer too, I know that's not easy at the beginning but the earlier you start the earlier you learn it!

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not sure if critique is allowed here, but here comes some lame stuff:
I think your eye placement is often a bit arkward. I feel like you don't have the right feel for the placement yet, if you draw the eyes just play around with the placement (copy, paste, transform) and see what's good. I think your lines for face and clothes have improved a lot on your ciel piece! The face overall could need some more bold shading, mainly under the hair strands, nose, over the eyes and under the neck. Better use a silky red/pink for skin shadows, feel free to browse through some art and pick the colors from there. As for the right eye, I think the shading in it is too blurry. Make it more bold again! I figured that many newer artists tend to blur shadows completely out, but that's no good. Oh and about the eyes, I think it's supposed to be your personal style but the way you make them... I personally don't like them soo much because they really stand out from the face, but they are actually supposed to be part of the face and to fit in well, if that makes sense ^^ also I'd draw hair strands over the eyes and not under. The hair shading looks a bit messy, it's good that you made the strokes along the flow of the hair but make sure that the shading isn't wobbly.. ughh how to say...
I only used the brush I gave you for that, it needs a lot of precision, so try not to just make some strokes and wing it, think carefully about every stroke you make! For example, on your ciel picture she shadow strokes on the hair just randomly ends on the top, it does look kinda weird, it doesn't flow well together with the outline you made, and I'd color the lines in a darker hue than the base color, for example the eyefolds and eye outlines. I hope all that makes sense... hopefully I was able to help you a bit! I'm sorry if that's not what you looked for ^^'''