Anyone has suggestions or images of how to make this car look nice with more power - inside, outside etc

Go for a browse mate. Basic modifications are all pretty standard accross the board.

Use the search function and photo galleries to look up the following on EL's..

Shocks, springs, wheel changes..
Intake, exhaust and cam upgrades..

After that you'll find specific's for your car, eg: Chips, bodykits etc..

how much u want to spend? I'm doing my brothers Ef GLi atm with little cash....

lower, tint windows, colour code body strips, mags, paint air intake, brake dust sheilds, paint interior plastics black.