Oooh, pretty. Left foot looks odd, though.

Elly looks like she belongs in Kingdom Hearts or something. Isn't she supposed to be old?

This is Elly from equi, so she's not old yet.

Its good that you're laying down color bases or "sploshes" but instead of using the smudge tool to blend the colors together you might want to try turning down the opacity of your brush and blending them with that, that way you don't end up softening your lines and making a mess of the colors.
About doing smooth lines with a mouse, I often have to go back over my lines as well, not much avoiding it with a mouse, what I do is I start off with a loose low opacity sketch, then I go over it with darker smoother lines, sometimes I use the line tool. Custom brushes? Nah. I use a few of the brushes that come with GIMP, that's about it though.

WIP

In college, I had a tablet set up, and someone asked me to make a spider-creeper, so, I obliged. The tablets there are awesome, they're Wacom, If I had photoshop at home I'd attempt to finish it with my supercheap tablet.

That is now my background.

I like shading on the creeper itself, but the red in the eyes and the cross-hatching(?) on the legs seem to disrupt the piece from keeping a continuous style.

On this page: creepers doin' the Creep followed by a Creeper creepin'. My day has been made.

Hey, just dropping a concept image and the accompanying layer pieces for yall to take a gander at what I'm going to be working with for my first mod.

All images in the .rar are ripped from the game CombatHeaven and are not my original work, but all subsequent pixels and sprites derived from said images will be 100% my work

i see the family resemblance.
do you?

Robot I did for kebbit in exchange of Planetside 2 beta key, based on his character in some RTD.

Yes, the outline is very jagged and unless you were attempting selective outlining, missing in some spots. The legs looks unfinished. Great robot though.

Jagged outlines and all-white metallic structure really remind me of Fraxy.

Not really happy with outline and legs myself either, might go over it one day and fix it up.
Aswell as change the palette to a more interesting one.