Don't do a free shop, cuz that just sets off my noob radar.
Just make a shop, stick to it. Don't go changing shops every few months. Eventually, you'll have the largest shop (perhaps not the cleanest) in all of Toridom.
Shade like it's porn, doesn't have to be totally accurate, just make it look nice and shiney and people will come. Like, don't hold back on your highlights and shadows. Hell, even give some parts a chrome look. What I do to simulate chrome is to use the gloss look up to a certain point in metal, just make one part light, then immediate go to darker. So it creates like a terraced effect. And on the sides, keep it bright. Works best with bands of metal. This is like the reflections you see in chromed out stuff, where objects get distorted and in effect, darken lines in the chrome.
Use less of the pillow shading you have at those top 2 panels. Not much actually would look like that. At the very least, you'd have two highlights running from corners to the interior corner of the "pillow" part.
Oshit, those are eyes, nvm.
I think gloss works well with large flat panels. You almost have it going on already on the side ones. Just dodge the top half. And do light burn on the bottom where it meets the bottom of the glossed area. If you really wanna make it look shiny, you can overdodge certain ridges for a bloom effect, that's what I did to some of the ridges in that last head.
Um don't be afraid to play with more complex unconventional shapes. Then try to make the most interesting way to shade them. That's what I did with the front of my last with the brows and that black area around the face. It looks a bit fresher IMO than just more triangles and square panels. Of course, I switched back to less organic shapes in the back for ease of shading. But doing the front was really fun, the shapes let me experiment a bit more.
Maybe make a more personal avatar? Stick with a certain theme? Maybe make it yourself.
Um, definitely link your shop in your sig. And hell, if you get toriprime, abuse that sig space with nice pictures of your best heads/set XD
You could post around arts and texture boards more, take up request and try really hard to do win each time. This would make you a more familiar presence. Plus you'd get your postcount up, which would 1) promote your sig link more and 2) make you look more trustworthy (maybe, for some people, perhaps).
You could give good criticism in the art boards, and of course learn from other's textures.
When you notice yourself getting faster, then maybe go up to the next res? It doesn't look like 512x512, might be wrong since my phone has different levels of zoom and I dunno what % it's at right now. Or do one more pass through your heads when you are done, you'll probably catch some unsmooth parts, maybe places that could be more matching with others, add more color, stuff like that.
You have good textures, so you probably shouldn't have to try so hard. Just stick to a shop, post in the art textures threads more, and keep doing the best you can. Yeah
/ramble
Hm, I'm hungry now.
Edit: holy fuck, I got carried away..... Um..... Yeah I had just woken from a nap and stuff....