yo thats way better than the other stuff you posted. I got 3 things for ya other than workin on letter structure:
1 add a shadow or 3d, it will help the piece pop off the wall.
2 more color with your fill, I like that you used a good amount of color as a whole, but the fill is boring, kinda takes away from that euro style lettering
3 do a second outline around all the letters and 3d(if it has 3d), It will make the letters pop out from the bg. If you decide to do, you gonna want to make it either a color that contrasts with your first outline(black) or a color that contrasts with the background(light blue). So for this piece I would have done an orange 2nd outline because it contrasts a little bit with both.
hope this is somewhat insightful... keep paintin