I hope I can be of help.
Ok first up. You could work on your linework a little more. Make it more sharp and smooth, take your time on it. It should take you the longest -most of the time-. Next, your clothing could use some more flare and life to it. Look at yourself in the mirror and see how the fabric folds and shapes to your body. Use that as a guideline. Next is hair. Try to make the hair more parted/ the linework chopped up. To give it more texture. Some shading and hilights would moke the texture pop more. Try to add more definiton of the shoulders. Make them more square. Try your best to center your face to the lower middle of the face -even i have a hard time doing so- Over all work on your lineart and your texture. over all you are at a good start ^^ hope this helps? -mostly using this pice as a ref to Critique hopefully it helps...- :}

Well, I guess I could give you some advice on how I draw, but I don´t know if you like my style at all :I
For once try shading with the soft brush, it´s smoother. You´re doing good already with the light-angle, so keep that up uwu