Here is some 'tries' I made with Adobe Flash.
I learn how to draw Lisa with the book 'Cartooning with the Simpsons' (a very good book for a begginer like me ) but I can't draw any other character of the show than Lisa for the moment . I have to learn how to draw backgrounds too...

So, the first picture is a high resolution of my avatar (colored and sketch versions on the same picture) and the two others are a simple drawing of Lisa (sketch and colored versions).

awwie... "simple_lisa_colored" (and his "sketch version) is so adorable... me like a lot.. a lot!!!   n_n''

Lo?c
I agree with Serge about that she looks just a tad bit pudgy, but overall nicely done. As I've said before I think you did a good job on your avatar. Maybe her spikes are just a bit off, but it doesn't bother me at all.

Ok, thanks for your advices.

Lisa with guns? It's a Win Win situation!

Seriously, the first one is a bit small yet i appreciate the idea, it could be great as a button. The second one is much more interesting, good crossover and very well done detail on Lisa's clothes-armor. As for Flash... it makes for good lines but lacks a bit in refining touches I'd suggest loading up the pic in PS or a similar program, and just brush some low opacity black color to create some very simple but effective shadows

Little update here...

This is my first try to draw Homer (and my first winged Lisa).
The picture is freely inspired by the fan-fiction Wings (by the way, thank you for this great fan-fiction Dagdamor ).

awwie.... nice nice!    poor lisa,  ... but her father is protecting her wings and beatiful eyes... I loved the scene ... especially the expression of the little girl 

*me print the pic.

Thanks

Lo?c
Thanks for posting the sketch! I see you have used construction method - my respect, lately I don't see much artists using it, hell knows why. People prefer drawing "on the fly", resulting with quick sketches having noticeable proportion mistakes... on your draft, both Lisa and Homer look correct.

If suggestions are welcome - when you draw legs, try positioning them on the picture just the same way you do with arms: i.e. if a character is turned to one side, like here, one hand is nearer to the viewer and therefore starts/ends lower than another one. The same with feet, for example Lisa's right foot should be positioned a bit lower, just like her right arm. That would give some additional volume to your picture.

Lo?c
Actually, following the rules is what makes you an artist!
Re: feet and hands - they aren't hard to draw. I use the following method: before drawing legs, I stand in the same position myself and imagine how that should look from chosen point of view, where big toes are and where little toes are. The same with hands - I just look at my own hand to decide how it should look (-1 finger of course ). Also, Cartooning book has many examples concerning limbs.
I should stop mumbling probably, but I hope to see more pictures from you. Good luck!

Not bad, not bad, but I think that the train is too detailed so it's tooking too much attentiveness. 

Lo?c
The main mistake in this picture is that you've drawn the "trailing" locomotive of the train. Yes, they are always exist to allow a train to move in both direction, but if you wouldn't draw it, it wouldn't be a big mistake, and the picture wouldn't look like it's an arrival, not a departure.
Also, Lisa has lost some of her spikes and her nose is almost invisible.
Sorry if I'm too nitpicking today, the picture is good nonetheless, especially the perspective and all those details on rails and the train. A touching picture...

It has already been said that the train is drawn so realistcally that it takes a bit the attention from Lisa's part of the picture (which detracts from the overall emotion) but i'd say that if your goal was to draw a realistic looking TGV you've succeeded
I like the hint of the shadow fallign behind Lisa like at sunset too.

Well, actually, this is wrong. The cars do share their wheels indeed, but not the locomotives. You also misplaced the pantograph (the thing that touches the catenaries [the wires]) a bit. Adding red lights would be appropriate, though. Nevertheless, this is a very nice picture.

This new picture is dedicated to all people who learned the meaning of the word 'stochastic' in the episode Lisa's Wedding (like me ).

In this picture, Lisa is explaining to me a mathematical exercise for an exam which I took two weeks ago.
Sorry about the background which is not well detailed: I'm not very good for drawing background.

There is maybe a reference to another episode in this picture... I let you guess...

Lo?c
I didn't know stochastic term means such a complex thing!
Also, Lisa writes with her left hand and for some reason draws an arrow from the spike to origin
But she has very good proportions overall, nice work with her hairstyle, her facial expression is a bit vague but I'll treat it as being proud of her formulas.
Also, very good, pleasant colors and the background, like 4D cube you used. Keep it up!

Lo?c
Some great pictures you posted! Lisa with the gun and Lisa on the railway station are my favourites. You have talent to draw The Simpsons!