My problem with the Castform? It's darker than Castform is in all official depictions (barring the menu icon), a very pale, light gray.
Also, while the white highlights are fine, I think the darker shade should be solid and not dithered. The shading is rarely ever dithering only in the GSC sprites. The eyes could also be moved down a bit, to make it look like it's staring down its opponent in a battle screen.
Hope I don't sound like a complete jerk here, it's a good sprite by all means.
@ Dex: The red looks too dark compared to the grey on the shiny, try picking a slightly darker grey to go with it. Also lose the three grey pixels on the belly, they stick out. No other crits really, even though it still looks a bit "too good" for the style. Maybe it needs a bit of white dithering on the head, I dunno.
Also, while the white highlights are fine, I think the darker shade should be solid and not dithered. The shading is rarely ever dithering only in the GSC sprites. The eyes could also be moved down a bit, to make it look like it's staring down its opponent in a battle screen.
Hope I don't sound like a complete jerk here, it's a good sprite by all means.
@ Dex: The red looks too dark compared to the grey on the shiny, try picking a slightly darker grey to go with it. Also lose the three grey pixels on the belly, they stick out. No other crits really, even though it still looks a bit "too good" for the style. Maybe it needs a bit of white dithering on the head, I dunno.