Well I'm going to give you a bit of constructive criticism to help you out. First things first, if you choose a B&W/B&G concept, there's no need to incorporate colors until you're a bit more experienced (just keep practicing). The focal is wayyyyy too big. If you're going to add a focal, unless it's a LP, you should scale it down. You can always re-size to your liking, as long as it doesn't take up half of the canvas. Try to use more vivid effects rather than just brushing, (I'm assuming you brushed a bit, but I could be wrong) like c4ds or fractals. I personally like to incorporate other stock images that may add flow and something to take out the negative space. You personally have left a lot of negative space in there, and that is very distracting to someone viewing the signature for criticism purposes. If you're going to use color, use some that complement eachother. And remember, if you're going to add text, add it last! You're still learning, so it's alright. Keep doing photoshop!