It's okay I dig simple signatures Love the colors but you need a liiittle work with the text. But still good.
What program are you using? I can help you a great deal if it's Photoshop or Paintshop Pro, but if it's GIMP, I can't really help you. xD Anyways, I'll start with what I can do until you answer. xD First off, I like the text placing, but someone else might argue with that (I'm not too great with text). Second, most of the time you want the main focus to fit into the frame a little better, in this sig, you have the render/stock a little too big for the size of the sig. Overall, way better than my first sig.
It's very impressive for a first. Despite being plain, the color looks very appealing. The things I'd work on are text and effects (keeping them organized) mostly. The text should always be somewhere near the render. It makes it appeal a lot more to the viewer. The effects department can easily be created by filters, C4D's, or any brushes you may have downloaded. Stock placement overall isn't bad either. But for future reference I'd try and placing so the body is apparent. In this piece here you don't need to do that sinec there are clearly arms coming out of her shoulders. But if you were to have a stock where the arms would not be visible unless shrinking the size, do so. However, only the point where the collar bone/upper chest/shoulders are noticeable. This makes things easier. And it gets rid of the "floating head" syndrome. Nice job. Keep up the work!
I'm good for some questions too if you want. But DW usually got a hang on most of them xD Try to add more of a design. For the first, it's decent. The colors and everything. The text isn't half bad as well, with the blur. Try to get some brushes, patterns, and fonts. Try to use a gradient and have a light source. With those, it'll be perfect.
Pretty plain. Apply image(Control+Alt+Shift+E) And run one of the ripple filters, erase over the render/stock(Your picture) and make the light brighter. That would make it a little more interesting.