Finished ones:

3 - Lithium [link]
7 - Nitrogen [link]
8 - Oxygen [link]
15 - Phosphorus [link]
16 - Sulfur [link]
26 - Iron [link]
34 - Selenium - [link]
47 - Silver [link]
53 - Iodine [link]
57 - Lanthanum [link]
79 - Gold [link]
87 - Francium [link]
99 - Einsteinium [link]
103 - Lawrencium [link]
117 - Ununseptium [link]

Still in pencil:

1 - Hydrogen [link]
2 - Helium [link]
5 - Boron [link]
6 - Carbon [link]
9 - Fluorine [link]
11 - Sodium [link]
12 - Magnesium [link]
14 - Silicon [link]
19 - Potassium [link]
20 - Calcium [link]
27 - Cobalt [link]
28 - Nickel [link]
29 - Copper [link]
30 - Zinc [link]
33 - Arsenic [link]
39 - Ytrium [link]
40 - Zirconium [link]
51 - Antimony [link]
54 - Xenon [link]
56 - Barium [link]
57 - Lanthanum [link]
59 - Praseodymium [link]
60 - Neodymium [link]
61 - Promethium [link]
63 - Europium [link]
64 - Gadolinium [link]
74 - Tungsten [link]
80 - Mercury [link]
82 - Lead [link]
86 - Radon [link]
88 - Radium [link]
89 - Actinium [link]
92 - Uranium [link]
96 - Curium [link]
105 - Dubnium [link]
109 - Meitnerium [link]
112 - Ununbium [link]

F.A.Q.
Q: Why are you doing all this? Is this some sort of a school project? Money? WHAT IS IT?
A: My significant other came up with this idea. I am doing this only for fun ^___^ And wish me luck to manage to draw all 118 8D

Q. What pencil do you use for drawing?
A: I use 2H pencil. I colour with Lyra pencils (they are very cheap )

Q. Do you study chemistry?
A: No, I study medicine XD