The shading is coming out really good:) i never used an airbrush but when i was painting minatures 20 years ago i was using a lot of dry brushing techniques, oh i miss these days,lol.
I have a suggestion about your tags, if you like you can start using the #creativecoin tag to receive CCC tokens along with steem. Also if you have another social media account and you share your steemit posts there, you can use the #posh tag along with the link that shows that you shared your post there as proof. The #palnet tag also is a good choice as you will receive pal tokens and the #oc for your original content.