For the front though, I have a few suggestions:
- choose just one picutre so it wont be too confusing or communicating too many ideas.
- the color should be attractive.
- the wording is great: emphasize a bit more on the top part. it should be bigger than the rest.
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one theme of color should be good
just go big and bold with the top words. Make people undesrtand what we sell. And put telephone graphic sign + 02-515-0600 and the website just like the roll up for the Subcon thing should be sufficient