Great work Liam! Keep at it. If this is your first day and try, you're doing great.
Question: What type of tablet are you using?
Also, If your using Photoshop a tip I like to use is to rotate the Canvas to find the right angle for my strokes. You can rotate the Canvas with R, draw, and then hit Escape to go back to the default. Try finding the angles you feel more comfortable, just like you would in a sheet of paper. It takes a little practice but is very rewarding. Also, I use shoulder and arm movements. I try to restrict wrist movements for when I'm detailing.
For straighter lines and circles I like to use 'ghosted lines' combined with rotating the canvas. From what I’ve gathered about 'ghosted lines' is to try to find the starting and ending points, practice the stroke without marking the line and then, when you feel confident, draw the line in a single and fast move to avoid scratching or wobbly lines. Again it takes a bit of practice and I’m by no means an expert. 
I hope this helps, let me know if I can help you further.
Have a great day Liam. ¡Pura Vida!
