Not bad. The first drawing I find probably the most odd, just because of the way Ruth's face is - it seems... off-key. I think it's something about the eye, it makes the face seem not at all like hers. Technically though, I can't be critical of the rest.

As for your two sketches, they're spot on. I can't find much to critique there. Hope to see more from you, and welcome to LTS!

Thank you much for the great comments! c: I plan to get a few more Lisa-centric pieces done soon.

Wow!
Anna-Unforgiven, those are great. Especially the last two. Please draw more like that!
You have good skills, and good imagination (I'd never think of a such scene featuring Ruth instead of Lora...) and Bart/Lisa look close to perfect too!

Anna
The first one is less interesting for me, as for simpsons-fan, so don't be surprised because of my rather frugal reaction. Well, it's colored and it gives to the work its own benefits.
As for other two sketches i can say it is very bad reflected on my phone' screen because of the reason i dont know. But the main thing that i can recognize, it's interesting. It has new characters and complex poses and it's a joy somehow to see such pictures. Because it's seen that the artist pays a time to create the works. And whats more important, the one puts the efforts, and its very glad to see.