my tip..
just do it simple.. (dont use fancy type)
make sure u used highress picture for cover... and if u used photoshop..
make sure tu used 300dpi an above..
if u want to do about nature.. used sans serif font for ur mask head to get the fill of nature... IMHO...
BTW...
why not u use illuistrator... i think ist batter using it then photoshop.. IMHO..

goodluck...