Bat WIP

What a lovely idea! (well, i assume she's into bats ofcourse )

I promised critique and feedback, I'll use this piece, but the crits will cover issues that are repeating in all your drawings. No worries, nothing bad, just helpful tips!

Alright: Linework, Lines are not bad, but think for a minute. Does anything in real life have actual lines (aside from manmade painted stuff). No, there are only shades that define forms and volumes. Take for example a mouth. you think there's a line between the lips, but it actually is just a very thin dark area made out of shadow.

So, while lines in art are good, it depends on the style how you use them. In your style they seem out of place. Not bad, just... not exactly fitting. Too, emphasized.

Try to keep your lines very light and subtle, just as a guide. Leave the shading to do the work. Dark versus light to create a contrast. In case of this bat, the fingers wouldn't show lines on an actual bat, but shading that defines the edge between the solid fingers and membrane of the wing itself. Intead of an actual line, some subtle shading would result in as softer more natural transition.

2: Try not to work at a little piece at a time, but try to always work on the whole picture. By this I mean, don't work out a little bit, and then move on. But work from broad strokes. Build your drawing with subtle guidelines, then shade it completely with a rough pass. Define roughly where shadow is, where light falls.
Then move in steps to finer and finer detail.

By doing this you keep a good view on things. You won't find shadows are incorrect, or that some parts turned out too light/dark unintentional.

Drawing, I see, is a bit like sculpting. You start with big shapes, and then work your way to the fine details.
Important is to always keep a clear view of the whol pictures, so the image is always in balance.

I assume this deviates very much from how you work now, but try it some time.

Shading: Well basically what I said above. First put down the shadows/light, then layer by layer add tone. Rather you draw too light and need another pass, than too dark with no way back to correct.
After you established your proper tones, then go in and add the detail, whatever they may be, pores, feathers veins...

Ok, so that's just some of the top of my head and what I noticed mostly in your work. It's just helpful tips, and I hope they help