"Hey there,
From the sounds of it, you need someone to take your existing design materials and revamp them— give them some extra, "umph". You need a designer who understand the very basics of designing and who has experience in developing. Does that sound about right?"
"My experience of 2+ years will help you in achieving your goals and I'm very well versed with Android Studio."
"Do you have examples of existing and desired design materials I could look at?
Are you available on Skype? Can we continue this conversation there?"
"I have no doubt we can hit your deadline if you have any, but the sooner we get started the better. Send me a reply with any questions you have and let's get started today."
PS I'm flexible with timings.