Working on new layouts before printing with TGC

I would strongly suggest a better font choice. This is the biggest issue I can find with this image.

Those fonts are very 80's looking and difficult to read. Make sure you check the kerning on the fonts too. Words like "Stealthy" look to read like "Steal thy" because of the spacing issue with the font.

The "Loadout" and "Payment" headings seem to be lost in space .. what do they belong to?

The color choices seem off for the theme. I don't know the game, but judging from the text, the theme looks to be dark and gritty, while the colors are bright and cheery.

I found the coloring a bit muddy and the kerning is problematic in places. One thing that can help letters pop is having contrasting borders or glow. What I've found is that truetype uses fill for the letter bodies in many graphic packages, if you give the font a fractional point border in a near white color and places a copied of the text above it, letters lift up aginst any background. Some software I can do it with glow, some with chisel or embossed, others shadow, depends on the software and the font.

Look at titles on books, many games, etc. and once you know to look for it, you'll see most of the best looking ones do that.

Also, for the red and green, you may want to fiddle with tone to give color blind people an option to play.

What programs are you using to create this? I could offer some visual suggestions, but not sure what you are using and what limitations there are graphically.

I haven't used that program myself, but it looks a little more limited than the Adobe Suite. Have you thought about getting Adobe CC? I'm not sure what you long term goals are, but it's worth the investment I feel, and sometimes for icons etc. it's much easier to work in vector rather than raster etc. Like the icons you have on the card might be cleaner as a vector rather than a raster image. They also give you access to a professional font library that'll give you a solid collection to choose from that won't have the kearning issues you're having. If you're unable to go that route with the GIMP program I would just try to clean up the muddy gradient, add some borders to visually separate items from one another, and if red is a must, I would go darker as a background and then have text and images sit on top of a light-colored placard or something. If you go the Adobe route just hit me up, I'd be willing to convert some of your raster to vector for ya.

Not relevant now as it is just a prototype, but if you want to go the open-source route with vector-based graphics, look at inkscape. I personally found the learning-curve quite steep, having previously also used the gimp quite a bit (gimp is an open-source photoshop-like program, for those who don't know it); I find it easiest to think of a vector-based image as being made up of layer upon layer of coloured paper, which you can then add smooth gradients to, rather than painting or drawing directly, like in gimp. One of their great advantages is that they can be scaled up as much as you like without showing pixels - actual graphic designers will probably know of other advantages besides this.