Very nice for a first. I think your main thing to worry about now is blending in your focal/render. This could also help your flow and fill out the negative space in your tag.
Remember to keep looking at tutorials, most people on this site know what they're doing and some do an awesome job, but they still encourage tutorials so that they can learn new things. So don't just stop now that you have basic knowledge of signature making.
Overall, good job and keep practicing!