This is actually a very nice batch for a beginner! :O Spock turned out especially well too!
I don't know much about GIMP so I can't give you any specifics, but I noticed you were open for concrit so, I might have some general things that could help?
One big thing that might help is trying to save in .png if you can. I noticed that .jpg tends to get pixelated more often, sometimes even if you set the quality as high as can be. If you can't save as .png or if you find that it makes your browser go bleh, don't worry about that. Just try to save as the highest quality .jpg if you can. :>
Another thing I've noticed is that several of your icons seem a tad bit faded, or even 'flat'; Category #1 especially. Does GIMP have an brightness/contrast tool at all? I use Photoshop Elements and I found that adjusting the contrast can help a lot in making colors stand out if I'm working with a low quality image. :>
Oh! Also on the low quality image front, it might help to play around with sharpen and blur tools. Some icons look a bit too sharp and others seem bit blurred but figuring out how to use those tools can help when you're working with an image that's a bit too much in either direction.
Overall though, I think you have a really good eye for composition and color is used quite effectively. (Spock especially stands out in both categories!) I think if you continue to play around with your program and experiment with all the different settings, you'll be able to make a lot of cool icons. :>
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I don't know much about GIMP so I can't give you any specifics, but I noticed you were open for concrit so, I might have some general things that could help?
One big thing that might help is trying to save in .png if you can. I noticed that .jpg tends to get pixelated more often, sometimes even if you set the quality as high as can be. If you can't save as .png or if you find that it makes your browser go bleh, don't worry about that. Just try to save as the highest quality .jpg if you can. :>
Another thing I've noticed is that several of your icons seem a tad bit faded, or even 'flat'; Category #1 especially. Does GIMP have an brightness/contrast tool at all? I use Photoshop Elements and I found that adjusting the contrast can help a lot in making colors stand out if I'm working with a low quality image. :>
Oh! Also on the low quality image front, it might help to play around with sharpen and blur tools. Some icons look a bit too sharp and others seem bit blurred but figuring out how to use those tools can help when you're working with an image that's a bit too much in either direction.
Overall though, I think you have a really good eye for composition and color is used quite effectively. (Spock especially stands out in both categories!) I think if you continue to play around with your program and experiment with all the different settings, you'll be able to make a lot of cool icons. :>