Volusion Website Improvements

We have an e-commerce site Volusion. We are looking for an expert who can make us three little things that we have failed. One is related to the deployment of special characters (ñ, accents, etc). Another is that we would have a section of "Shop by Brand" (on this information as we do). And the other is that we need to have a section where we can see the categories and their photos (Style menu). We would like someone who has experience with Volusion to also can help us see what else we can improve. Thank you.