Looking good!
I'd say you have dry-brushed enough my freind, what you need now are some filters/washes to bring out the details. Then get some mud on there and you'll be away!
BTW where are the transfers?
As a Korsun pocket dio, are you using Dragon's Gen2 'Korsun Pocket Desperate Defense' Figures? I've just built them and they are excellent, fully recomended! Would build up nicely withy this Wespe.
Keep up the good work and keep us posted with your progress,
James